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Finding the Fourth Proportional to 287,293.60, 431,134.80 and 129,440.80

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Solution

The fourth proportional to 287,293.60, 431,134.80 and 129,440.80 is: 194,248.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,293.60 : 431,134.80 = 129,440.80 : x
  2. Step 2: Convert to fraction form
    287,293.60/431,134.80 = 129,440.80/x
  3. Step 3: Cross multiply
    287,293.60x = 431,134.80 × 129,440.80
  4. Step 4: Simplify right side
    287,293.60x = 55,806,433,419.84
  5. Step 5: Solve for x
    x = 55,806,433,419.84/287,293.60
  6. Step 6: Final answer
    x = 194,248.79

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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.