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Finding the Fourth Proportional to 8,235.70, 12,353.55 and 7,312.30

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Solution

The fourth proportional to 8,235.70, 12,353.55 and 7,312.30 is: 10,968.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,235.70 : 12,353.55 = 7,312.30 : x
  2. Step 2: Convert to fraction form
    8,235.70/12,353.55 = 7,312.30/x
  3. Step 3: Cross multiply
    8,235.70x = 12,353.55 × 7,312.30
  4. Step 4: Simplify right side
    8,235.70x = 90,332,863.67
  5. Step 5: Solve for x
    x = 90,332,863.67/8,235.70
  6. Step 6: Final answer
    x = 10,968.45

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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.