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Finding the Fourth Proportional to 287,400.60, 431,100.90 and 100,387.80

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Solution

The fourth proportional to 287,400.60, 431,100.90 and 100,387.80 is: 150,581.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,400.60 : 431,100.90 = 100,387.80 : x
  2. Step 2: Convert to fraction form
    287,400.60/431,100.90 = 100,387.80/x
  3. Step 3: Cross multiply
    287,400.60x = 431,100.90 × 100,387.80
  4. Step 4: Simplify right side
    287,400.60x = 43,277,270,929.02
  5. Step 5: Solve for x
    x = 43,277,270,929.02/287,400.60
  6. Step 6: Final answer
    x = 150,581.70

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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.