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Finding the Fourth Proportional to 218,672.70, 327,911.85 and 85,508.70

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Solution

The fourth proportional to 218,672.70, 327,911.85 and 85,508.70 is: 128,225.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,672.70 : 327,911.85 = 85,508.70 : x
  2. Step 2: Convert to fraction form
    218,672.70/327,911.85 = 85,508.70/x
  3. Step 3: Cross multiply
    218,672.70x = 327,911.85 × 85,508.70
  4. Step 4: Simplify right side
    218,672.70x = 28,039,316,008.10
  5. Step 5: Solve for x
    x = 28,039,316,008.10/218,672.70
  6. Step 6: Final answer
    x = 128,225.04

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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.