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Finding the Fourth Proportional to 210,781.62, 290,889.28 and 124,789.95

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Solution

The fourth proportional to 210,781.62, 290,889.28 and 124,789.95 is: 172,216.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,781.62 : 290,889.28 = 124,789.95 : x
  2. Step 2: Convert to fraction form
    210,781.62/290,889.28 = 124,789.95/x
  3. Step 3: Cross multiply
    210,781.62x = 290,889.28 × 124,789.95
  4. Step 4: Simplify right side
    210,781.62x = 36,300,058,706.74
  5. Step 5: Solve for x
    x = 36,300,058,706.74/210,781.62
  6. Step 6: Final answer
    x = 172,216.43

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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.