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Finding the Fourth Proportional to 702.12, 1,051.11 and 615.63

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Solution

The fourth proportional to 702.12, 1,051.11 and 615.63 is: 921.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.12 : 1,051.11 = 615.63 : x
  2. Step 2: Convert to fraction form
    702.12/1,051.11 = 615.63/x
  3. Step 3: Cross multiply
    702.12x = 1,051.11 × 615.63
  4. Step 4: Simplify right side
    702.12x = 647,094.85
  5. Step 5: Solve for x
    x = 647,094.85/702.12
  6. Step 6: Final answer
    x = 921.63

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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.