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Finding the Fourth Proportional to 71,490.36, 98,656.74 and 39,659.28

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Solution

The fourth proportional to 71,490.36, 98,656.74 and 39,659.28 is: 54,729.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,490.36 : 98,656.74 = 39,659.28 : x
  2. Step 2: Convert to fraction form
    71,490.36/98,656.74 = 39,659.28/x
  3. Step 3: Cross multiply
    71,490.36x = 98,656.74 × 39,659.28
  4. Step 4: Simplify right side
    71,490.36x = 3,912,655,077.25
  5. Step 5: Solve for x
    x = 3,912,655,077.25/71,490.36
  6. Step 6: Final answer
    x = 54,729.83

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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.