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Finding the Fourth Proportional to 877.68, 1,211.20 and 546.12

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Solution

The fourth proportional to 877.68, 1,211.20 and 546.12 is: 753.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.68 : 1,211.20 = 546.12 : x
  2. Step 2: Convert to fraction form
    877.68/1,211.20 = 546.12/x
  3. Step 3: Cross multiply
    877.68x = 1,211.20 × 546.12
  4. Step 4: Simplify right side
    877.68x = 661,460.54
  5. Step 5: Solve for x
    x = 661,460.54/877.68
  6. Step 6: Final answer
    x = 753.65

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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.