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Finding the Fourth Proportional to 15,149.70, 20,916.86 and 9,486.72

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Solution

The fourth proportional to 15,149.70, 20,916.86 and 9,486.72 is: 13,098.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,149.70 : 20,916.86 = 9,486.72 : x
  2. Step 2: Convert to fraction form
    15,149.70/20,916.86 = 9,486.72/x
  3. Step 3: Cross multiply
    15,149.70x = 20,916.86 × 9,486.72
  4. Step 4: Simplify right side
    15,149.70x = 198,432,346.67
  5. Step 5: Solve for x
    x = 198,432,346.67/15,149.70
  6. Step 6: Final answer
    x = 13,098.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.