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Finding the Fourth Proportional to 15,123.86, 20,866.10 and 9,153.62

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Solution

The fourth proportional to 15,123.86, 20,866.10 and 9,153.62 is: 12,629.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,123.86 : 20,866.10 = 9,153.62 : x
  2. Step 2: Convert to fraction form
    15,123.86/20,866.10 = 9,153.62/x
  3. Step 3: Cross multiply
    15,123.86x = 20,866.10 × 9,153.62
  4. Step 4: Simplify right side
    15,123.86x = 191,000,350.28
  5. Step 5: Solve for x
    x = 191,000,350.28/15,123.86
  6. Step 6: Final answer
    x = 12,629.07

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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.