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Finding the Fourth Proportional to 40,439.20, 60,658.80 and 15,815.20

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Solution

The fourth proportional to 40,439.20, 60,658.80 and 15,815.20 is: 23,722.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,439.20 : 60,658.80 = 15,815.20 : x
  2. Step 2: Convert to fraction form
    40,439.20/60,658.80 = 15,815.20/x
  3. Step 3: Cross multiply
    40,439.20x = 60,658.80 × 15,815.20
  4. Step 4: Simplify right side
    40,439.20x = 959,331,053.76
  5. Step 5: Solve for x
    x = 959,331,053.76/40,439.20
  6. Step 6: Final answer
    x = 23,722.80

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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.