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Finding the Fourth Proportional to 10,610.80, 15,916.20 and 9,120.40

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Solution

The fourth proportional to 10,610.80, 15,916.20 and 9,120.40 is: 13,680.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,610.80 : 15,916.20 = 9,120.40 : x
  2. Step 2: Convert to fraction form
    10,610.80/15,916.20 = 9,120.40/x
  3. Step 3: Cross multiply
    10,610.80x = 15,916.20 × 9,120.40
  4. Step 4: Simplify right side
    10,610.80x = 145,162,110.48
  5. Step 5: Solve for x
    x = 145,162,110.48/10,610.80
  6. Step 6: Final answer
    x = 13,680.60

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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.