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Finding the Fourth Proportional to 72,924.50, 100,635.85 and 39,390.50

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Solution

The fourth proportional to 72,924.50, 100,635.85 and 39,390.50 is: 54,358.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,924.50 : 100,635.85 = 39,390.50 : x
  2. Step 2: Convert to fraction form
    72,924.50/100,635.85 = 39,390.50/x
  3. Step 3: Cross multiply
    72,924.50x = 100,635.85 × 39,390.50
  4. Step 4: Simplify right side
    72,924.50x = 3,964,096,449.43
  5. Step 5: Solve for x
    x = 3,964,096,449.43/72,924.50
  6. Step 6: Final answer
    x = 54,358.91

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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.