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Finding the Fourth Proportional to 702.17, 1,057.40 and 611.95

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Solution

The fourth proportional to 702.17, 1,057.40 and 611.95 is: 921.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.17 : 1,057.40 = 611.95 : x
  2. Step 2: Convert to fraction form
    702.17/1,057.40 = 611.95/x
  3. Step 3: Cross multiply
    702.17x = 1,057.40 × 611.95
  4. Step 4: Simplify right side
    702.17x = 647,075.93
  5. Step 5: Solve for x
    x = 647,075.93/702.17
  6. Step 6: Final answer
    x = 921.54

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.