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Finding the Fourth Proportional to 64,988.88, 89,679.20 and 38,128.56

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Solution

The fourth proportional to 64,988.88, 89,679.20 and 38,128.56 is: 52,614.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,988.88 : 89,679.20 = 38,128.56 : x
  2. Step 2: Convert to fraction form
    64,988.88/89,679.20 = 38,128.56/x
  3. Step 3: Cross multiply
    64,988.88x = 89,679.20 × 38,128.56
  4. Step 4: Simplify right side
    64,988.88x = 3,419,338,757.95
  5. Step 5: Solve for x
    x = 3,419,338,757.95/64,988.88
  6. Step 6: Final answer
    x = 52,614.21

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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.