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Finding the Fourth Proportional to 9,890.92, 14,836.38 and 8,420.68

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Solution

The fourth proportional to 9,890.92, 14,836.38 and 8,420.68 is: 12,631.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,890.92 : 14,836.38 = 8,420.68 : x
  2. Step 2: Convert to fraction form
    9,890.92/14,836.38 = 8,420.68/x
  3. Step 3: Cross multiply
    9,890.92x = 14,836.38 × 8,420.68
  4. Step 4: Simplify right side
    9,890.92x = 124,932,408.34
  5. Step 5: Solve for x
    x = 124,932,408.34/9,890.92
  6. Step 6: Final answer
    x = 12,631.02

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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.