Home / 218,948.80-328,423.20-78,721.60

Finding the Fourth Proportional to 218,948.80, 328,423.20 and 78,721.60

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Solution

The fourth proportional to 218,948.80, 328,423.20 and 78,721.60 is: 118,082.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,948.80 : 328,423.20 = 78,721.60 : x
  2. Step 2: Convert to fraction form
    218,948.80/328,423.20 = 78,721.60/x
  3. Step 3: Cross multiply
    218,948.80x = 328,423.20 × 78,721.60
  4. Step 4: Simplify right side
    218,948.80x = 25,853,999,781.12
  5. Step 5: Solve for x
    x = 25,853,999,781.12/218,948.80
  6. Step 6: Final answer
    x = 118,082.40

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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.