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Finding the Fourth Proportional to 877.71, 1,211.31 and 528.39

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Solution

The fourth proportional to 877.71, 1,211.31 and 528.39 is: 729.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.71 : 1,211.31 = 528.39 : x
  2. Step 2: Convert to fraction form
    877.71/1,211.31 = 528.39/x
  3. Step 3: Cross multiply
    877.71x = 1,211.31 × 528.39
  4. Step 4: Simplify right side
    877.71x = 640,044.09
  5. Step 5: Solve for x
    x = 640,044.09/877.71
  6. Step 6: Final answer
    x = 729.22

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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.