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Finding the Fourth Proportional to 71,031.28, 98,051.28 and 42,731.56

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Solution

The fourth proportional to 71,031.28, 98,051.28 and 42,731.56 is: 58,986.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,031.28 : 98,051.28 = 42,731.56 : x
  2. Step 2: Convert to fraction form
    71,031.28/98,051.28 = 42,731.56/x
  3. Step 3: Cross multiply
    71,031.28x = 98,051.28 × 42,731.56
  4. Step 4: Simplify right side
    71,031.28x = 4,189,884,154.40
  5. Step 5: Solve for x
    x = 4,189,884,154.40/71,031.28
  6. Step 6: Final answer
    x = 58,986.47

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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.