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Finding the Fourth Proportional to 100,451.34, 138,628.97 and 66,400.76

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Solution

The fourth proportional to 100,451.34, 138,628.97 and 66,400.76 is: 91,637.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,451.34 : 138,628.97 = 66,400.76 : x
  2. Step 2: Convert to fraction form
    100,451.34/138,628.97 = 66,400.76/x
  3. Step 3: Cross multiply
    100,451.34x = 138,628.97 × 66,400.76
  4. Step 4: Simplify right side
    100,451.34x = 9,205,069,229.59
  5. Step 5: Solve for x
    x = 9,205,069,229.59/100,451.34
  6. Step 6: Final answer
    x = 91,637.10

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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.