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Finding the Fourth Proportional to 877.55, 1,211.29 and 545.78

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Solution

The fourth proportional to 877.55, 1,211.29 and 545.78 is: 753.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.55 : 1,211.29 = 545.78 : x
  2. Step 2: Convert to fraction form
    877.55/1,211.29 = 545.78/x
  3. Step 3: Cross multiply
    877.55x = 1,211.29 × 545.78
  4. Step 4: Simplify right side
    877.55x = 661,091.80
  5. Step 5: Solve for x
    x = 661,091.80/877.55
  6. Step 6: Final answer
    x = 753.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.