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Finding the Fourth Proportional to 287,221.60, 431,026.80 and 129,368.80

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Solution

The fourth proportional to 287,221.60, 431,026.80 and 129,368.80 is: 194,140.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,221.60 : 431,026.80 = 129,368.80 : x
  2. Step 2: Convert to fraction form
    287,221.60/431,026.80 = 129,368.80/x
  3. Step 3: Cross multiply
    287,221.60x = 431,026.80 × 129,368.80
  4. Step 4: Simplify right side
    287,221.60x = 55,761,419,883.84
  5. Step 5: Solve for x
    x = 55,761,419,883.84/287,221.60
  6. Step 6: Final answer
    x = 194,140.76

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1.5x scale

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.