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Finding the Fourth Proportional to 221,385.89, 305,458.18 and 129,490.88

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Solution

The fourth proportional to 221,385.89, 305,458.18 and 129,490.88 is: 178,665.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,385.89 : 305,458.18 = 129,490.88 : x
  2. Step 2: Convert to fraction form
    221,385.89/305,458.18 = 129,490.88/x
  3. Step 3: Cross multiply
    221,385.89x = 305,458.18 × 129,490.88
  4. Step 4: Simplify right side
    221,385.89x = 39,554,048,531.40
  5. Step 5: Solve for x
    x = 39,554,048,531.40/221,385.89
  6. Step 6: Final answer
    x = 178,665.63

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1.5x scale

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.