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Finding the Fourth Proportional to 287,575.20, 431,557.20 and 161,215.20

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Solution

The fourth proportional to 287,575.20, 431,557.20 and 161,215.20 is: 241,931.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,575.20 : 431,557.20 = 161,215.20 : x
  2. Step 2: Convert to fraction form
    287,575.20/431,557.20 = 161,215.20/x
  3. Step 3: Cross multiply
    287,575.20x = 431,557.20 × 161,215.20
  4. Step 4: Simplify right side
    287,575.20x = 69,573,580,309.44
  5. Step 5: Solve for x
    x = 69,573,580,309.44/287,575.20
  6. Step 6: Final answer
    x = 241,931.78

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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.