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Finding the Fourth Proportional to 69,028.68, 103,646.70 and 39,479.88

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Solution

The fourth proportional to 69,028.68, 103,646.70 and 39,479.88 is: 59,279.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,028.68 : 103,646.70 = 39,479.88 : x
  2. Step 2: Convert to fraction form
    69,028.68/103,646.70 = 39,479.88/x
  3. Step 3: Cross multiply
    69,028.68x = 103,646.70 × 39,479.88
  4. Step 4: Simplify right side
    69,028.68x = 4,091,959,278.40
  5. Step 5: Solve for x
    x = 4,091,959,278.40/69,028.68
  6. Step 6: Final answer
    x = 59,279.12

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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.