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Finding the Fourth Proportional to 702.72, 1,055.70 and 681.66

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Solution

The fourth proportional to 702.72, 1,055.70 and 681.66 is: 1,024.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.72 : 1,055.70 = 681.66 : x
  2. Step 2: Convert to fraction form
    702.72/1,055.70 = 681.66/x
  3. Step 3: Cross multiply
    702.72x = 1,055.70 × 681.66
  4. Step 4: Simplify right side
    702.72x = 719,628.46
  5. Step 5: Solve for x
    x = 719,628.46/702.72
  6. Step 6: Final answer
    x = 1,024.06

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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.