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Finding the Fourth Proportional to 287,490.64, 431,319.18 and 118,979.88

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Solution

The fourth proportional to 287,490.64, 431,319.18 and 118,979.88 is: 178,504.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,490.64 : 431,319.18 = 118,979.88 : x
  2. Step 2: Convert to fraction form
    287,490.64/431,319.18 = 118,979.88/x
  3. Step 3: Cross multiply
    287,490.64x = 431,319.18 × 118,979.88
  4. Step 4: Simplify right side
    287,490.64x = 51,318,304,278.10
  5. Step 5: Solve for x
    x = 51,318,304,278.10/287,490.64
  6. Step 6: Final answer
    x = 178,504.26

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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.