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Finding the Fourth Proportional to 100,521.69, 138,723.17 and 58,080.21

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Solution

The fourth proportional to 100,521.69, 138,723.17 and 58,080.21 is: 80,152.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,521.69 : 138,723.17 = 58,080.21 : x
  2. Step 2: Convert to fraction form
    100,521.69/138,723.17 = 58,080.21/x
  3. Step 3: Cross multiply
    100,521.69x = 138,723.17 × 58,080.21
  4. Step 4: Simplify right side
    100,521.69x = 8,057,070,555.06
  5. Step 5: Solve for x
    x = 8,057,070,555.06/100,521.69
  6. Step 6: Final answer
    x = 80,152.56

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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.