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Finding the Fourth Proportional to 218,780.20, 328,073.10 and 85,616.20

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Solution

The fourth proportional to 218,780.20, 328,073.10 and 85,616.20 is: 128,386.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,780.20 : 328,073.10 = 85,616.20 : x
  2. Step 2: Convert to fraction form
    218,780.20/328,073.10 = 85,616.20/x
  3. Step 3: Cross multiply
    218,780.20x = 328,073.10 × 85,616.20
  4. Step 4: Simplify right side
    218,780.20x = 28,088,372,144.22
  5. Step 5: Solve for x
    x = 28,088,372,144.22/218,780.20
  6. Step 6: Final answer
    x = 128,386.26

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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.