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Finding the Fourth Proportional to 287,220.60, 431,025.30 and 129,367.80

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Solution

The fourth proportional to 287,220.60, 431,025.30 and 129,367.80 is: 194,139.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,220.60 : 431,025.30 = 129,367.80 : x
  2. Step 2: Convert to fraction form
    287,220.60/431,025.30 = 129,367.80/x
  3. Step 3: Cross multiply
    287,220.60x = 431,025.30 × 129,367.80
  4. Step 4: Simplify right side
    287,220.60x = 55,760,794,805.34
  5. Step 5: Solve for x
    x = 55,760,794,805.34/287,220.60
  6. Step 6: Final answer
    x = 194,139.26

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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.