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Finding the Fourth Proportional to 287,712.80, 431,577.39 and 88,028.76

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Solution

The fourth proportional to 287,712.80, 431,577.39 and 88,028.76 is: 132,045.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,712.80 : 431,577.39 = 88,028.76 : x
  2. Step 2: Convert to fraction form
    287,712.80/431,577.39 = 88,028.76/x
  3. Step 3: Cross multiply
    287,712.80x = 431,577.39 × 88,028.76
  4. Step 4: Simplify right side
    287,712.80x = 37,991,222,485.74
  5. Step 5: Solve for x
    x = 37,991,222,485.74/287,712.80
  6. Step 6: Final answer
    x = 132,045.65

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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.