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Finding the Fourth Proportional to 1,139.97, 1,573.26 and 642.66

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Solution

The fourth proportional to 1,139.97, 1,573.26 and 642.66 is: 886.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.97 : 1,573.26 = 642.66 : x
  2. Step 2: Convert to fraction form
    1,139.97/1,573.26 = 642.66/x
  3. Step 3: Cross multiply
    1,139.97x = 1,573.26 × 642.66
  4. Step 4: Simplify right side
    1,139.97x = 1,011,071.27
  5. Step 5: Solve for x
    x = 1,011,071.27/1,139.97
  6. Step 6: Final answer
    x = 886.93

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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.