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Finding the Fourth Proportional to 877.68, 1,211.21 and 484.70

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Solution

The fourth proportional to 877.68, 1,211.21 and 484.70 is: 668.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.68 : 1,211.21 = 484.70 : x
  2. Step 2: Convert to fraction form
    877.68/1,211.21 = 484.70/x
  3. Step 3: Cross multiply
    877.68x = 1,211.21 × 484.70
  4. Step 4: Simplify right side
    877.68x = 587,065.01
  5. Step 5: Solve for x
    x = 587,065.01/877.68
  6. Step 6: Final answer
    x = 668.88

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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.