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Finding the Fourth Proportional to 287,381.54, 431,139.33 and 87,701.55

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Solution

The fourth proportional to 287,381.54, 431,139.33 and 87,701.55 is: 131,572.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,381.54 : 431,139.33 = 87,701.55 : x
  2. Step 2: Convert to fraction form
    287,381.54/431,139.33 = 87,701.55/x
  3. Step 3: Cross multiply
    287,381.54x = 431,139.33 × 87,701.55
  4. Step 4: Simplify right side
    287,381.54x = 37,811,587,506.96
  5. Step 5: Solve for x
    x = 37,811,587,506.96/287,381.54
  6. Step 6: Final answer
    x = 131,572.78

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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.