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Finding the Fourth Proportional to 100,387.61, 138,532.51 and 55,065.21

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Solution

The fourth proportional to 100,387.61, 138,532.51 and 55,065.21 is: 75,988.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,387.61 : 138,532.51 = 55,065.21 : x
  2. Step 2: Convert to fraction form
    100,387.61/138,532.51 = 55,065.21/x
  3. Step 3: Cross multiply
    100,387.61x = 138,532.51 × 55,065.21
  4. Step 4: Simplify right side
    100,387.61x = 7,628,321,754.98
  5. Step 5: Solve for x
    x = 7,628,321,754.98/100,387.61
  6. Step 6: Final answer
    x = 75,988.68

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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.