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Finding the Fourth Proportional to 218,726.72, 301,841.88 and 121,929.30

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Solution

The fourth proportional to 218,726.72, 301,841.88 and 121,929.30 is: 168,261.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,726.72 : 301,841.88 = 121,929.30 : x
  2. Step 2: Convert to fraction form
    218,726.72/301,841.88 = 121,929.30/x
  3. Step 3: Cross multiply
    218,726.72x = 301,841.88 × 121,929.30
  4. Step 4: Simplify right side
    218,726.72x = 36,803,369,139.08
  5. Step 5: Solve for x
    x = 36,803,369,139.08/218,726.72
  6. Step 6: Final answer
    x = 168,261.88

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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.