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Finding the Fourth Proportional to 777.80, 1,167.32 and 545.20

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Solution

The fourth proportional to 777.80, 1,167.32 and 545.20 is: 818.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.80 : 1,167.32 = 545.20 : x
  2. Step 2: Convert to fraction form
    777.80/1,167.32 = 545.20/x
  3. Step 3: Cross multiply
    777.80x = 1,167.32 × 545.20
  4. Step 4: Simplify right side
    777.80x = 636,422.86
  5. Step 5: Solve for x
    x = 636,422.86/777.80
  6. Step 6: Final answer
    x = 818.23

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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.