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Finding the Fourth Proportional to 71,338.76, 107,008 and 21,418.78

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Solution

The fourth proportional to 71,338.76, 107,008 and 21,418.78 is: 32,128.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,338.76 : 107,008 = 21,418.78 : x
  2. Step 2: Convert to fraction form
    71,338.76/107,008 = 21,418.78/x
  3. Step 3: Cross multiply
    71,338.76x = 107,008 × 21,418.78
  4. Step 4: Simplify right side
    71,338.76x = 2,291,980,810.24
  5. Step 5: Solve for x
    x = 2,291,980,810.24/71,338.76
  6. Step 6: Final answer
    x = 32,128.13

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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.