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Finding the Fourth Proportional to 877.52, 1,211.04 and 528.20

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Solution

The fourth proportional to 877.52, 1,211.04 and 528.20 is: 728.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.52 : 1,211.04 = 528.20 : x
  2. Step 2: Convert to fraction form
    877.52/1,211.04 = 528.20/x
  3. Step 3: Cross multiply
    877.52x = 1,211.04 × 528.20
  4. Step 4: Simplify right side
    877.52x = 639,671.33
  5. Step 5: Solve for x
    x = 639,671.33/877.52
  6. Step 6: Final answer
    x = 728.95

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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.