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Finding the Fourth Proportional to 100,689.40, 138,935.82 and 58,251.88

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Solution

The fourth proportional to 100,689.40, 138,935.82 and 58,251.88 is: 80,378.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,689.40 : 138,935.82 = 58,251.88 : x
  2. Step 2: Convert to fraction form
    100,689.40/138,935.82 = 58,251.88/x
  3. Step 3: Cross multiply
    100,689.40x = 138,935.82 × 58,251.88
  4. Step 4: Simplify right side
    100,689.40x = 8,093,272,714.34
  5. Step 5: Solve for x
    x = 8,093,272,714.34/100,689.40
  6. Step 6: Final answer
    x = 80,378.60

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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.