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Finding the Fourth Proportional to 9,428.90, 14,143.35 and 8,408.30

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Solution

The fourth proportional to 9,428.90, 14,143.35 and 8,408.30 is: 12,612.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,428.90 : 14,143.35 = 8,408.30 : x
  2. Step 2: Convert to fraction form
    9,428.90/14,143.35 = 8,408.30/x
  3. Step 3: Cross multiply
    9,428.90x = 14,143.35 × 8,408.30
  4. Step 4: Simplify right side
    9,428.90x = 118,921,529.81
  5. Step 5: Solve for x
    x = 118,921,529.81/9,428.90
  6. Step 6: Final answer
    x = 12,612.45

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.