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Finding the Fourth Proportional to 215,391.76, 297,274.05 and 129,398.61

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Solution

The fourth proportional to 215,391.76, 297,274.05 and 129,398.61 is: 178,590.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,391.76 : 297,274.05 = 129,398.61 : x
  2. Step 2: Convert to fraction form
    215,391.76/297,274.05 = 129,398.61/x
  3. Step 3: Cross multiply
    215,391.76x = 297,274.05 × 129,398.61
  4. Step 4: Simplify right side
    215,391.76x = 38,466,849,973.85
  5. Step 5: Solve for x
    x = 38,466,849,973.85/215,391.76
  6. Step 6: Final answer
    x = 178,590.17

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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.