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Finding the Fourth Proportional to 287,593.19, 431,390.90 and 87,912.80

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Solution

The fourth proportional to 287,593.19, 431,390.90 and 87,912.80 is: 131,869.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,593.19 : 431,390.90 = 87,912.80 : x
  2. Step 2: Convert to fraction form
    287,593.19/431,390.90 = 87,912.80/x
  3. Step 3: Cross multiply
    287,593.19x = 431,390.90 × 87,912.80
  4. Step 4: Simplify right side
    287,593.19x = 37,924,781,913.52
  5. Step 5: Solve for x
    x = 37,924,781,913.52/287,593.19
  6. Step 6: Final answer
    x = 131,869.54

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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.