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Finding the Fourth Proportional to 71,392.59, 98,521.79 and 39,128.49

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Solution

The fourth proportional to 71,392.59, 98,521.79 and 39,128.49 is: 53,997.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,392.59 : 98,521.79 = 39,128.49 : x
  2. Step 2: Convert to fraction form
    71,392.59/98,521.79 = 39,128.49/x
  3. Step 3: Cross multiply
    71,392.59x = 98,521.79 × 39,128.49
  4. Step 4: Simplify right side
    71,392.59x = 3,855,009,218.92
  5. Step 5: Solve for x
    x = 3,855,009,218.92/71,392.59
  6. Step 6: Final answer
    x = 53,997.33

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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.