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Finding the Fourth Proportional to 90,423.42, 135,638.20 and 36,387.42

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Solution

The fourth proportional to 90,423.42, 135,638.20 and 36,387.42 is: 54,582.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,423.42 : 135,638.20 = 36,387.42 : x
  2. Step 2: Convert to fraction form
    90,423.42/135,638.20 = 36,387.42/x
  3. Step 3: Cross multiply
    90,423.42x = 135,638.20 × 36,387.42
  4. Step 4: Simplify right side
    90,423.42x = 4,935,524,151.44
  5. Step 5: Solve for x
    x = 4,935,524,151.44/90,423.42
  6. Step 6: Final answer
    x = 54,582.37

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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.