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Finding the Fourth Proportional to 257,721, 386,588.79 and 70,732.50

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Solution

The fourth proportional to 257,721, 386,588.79 and 70,732.50 is: 106,100.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,721 : 386,588.79 = 70,732.50 : x
  2. Step 2: Convert to fraction form
    257,721/386,588.79 = 70,732.50/x
  3. Step 3: Cross multiply
    257,721x = 386,588.79 × 70,732.50
  4. Step 4: Simplify right side
    257,721x = 27,344,391,588.68
  5. Step 5: Solve for x
    x = 27,344,391,588.68/257,721
  6. Step 6: Final answer
    x = 106,100.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.