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Finding the Fourth Proportional to 287,690.60, 431,211.90 and 138,002.60

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Solution

The fourth proportional to 287,690.60, 431,211.90 and 138,002.60 is: 206,848.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,690.60 : 431,211.90 = 138,002.60 : x
  2. Step 2: Convert to fraction form
    287,690.60/431,211.90 = 138,002.60/x
  3. Step 3: Cross multiply
    287,690.60x = 431,211.90 × 138,002.60
  4. Step 4: Simplify right side
    287,690.60x = 59,508,363,350.94
  5. Step 5: Solve for x
    x = 59,508,363,350.94/287,690.60
  6. Step 6: Final answer
    x = 206,848.48

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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.