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Finding the Fourth Proportional to 702.90, 1,052.27 and 521.11

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Solution

The fourth proportional to 702.90, 1,052.27 and 521.11 is: 780.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.90 : 1,052.27 = 521.11 : x
  2. Step 2: Convert to fraction form
    702.90/1,052.27 = 521.11/x
  3. Step 3: Cross multiply
    702.90x = 1,052.27 × 521.11
  4. Step 4: Simplify right side
    702.90x = 548,348.42
  5. Step 5: Solve for x
    x = 548,348.42/702.90
  6. Step 6: Final answer
    x = 780.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.