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Finding the Fourth Proportional to 287,585.60, 431,815.80 and 221,100.80

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Solution

The fourth proportional to 287,585.60, 431,815.80 and 221,100.80 is: 331,987.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,585.60 : 431,815.80 = 221,100.80 : x
  2. Step 2: Convert to fraction form
    287,585.60/431,815.80 = 221,100.80/x
  3. Step 3: Cross multiply
    287,585.60x = 431,815.80 × 221,100.80
  4. Step 4: Simplify right side
    287,585.60x = 95,474,818,832.64
  5. Step 5: Solve for x
    x = 95,474,818,832.64/287,585.60
  6. Step 6: Final answer
    x = 331,987.48

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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.