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Finding the Fourth Proportional to 988.52, 1,366.62 and 865.40

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Solution

The fourth proportional to 988.52, 1,366.62 and 865.40 is: 1,196.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.52 : 1,366.62 = 865.40 : x
  2. Step 2: Convert to fraction form
    988.52/1,366.62 = 865.40/x
  3. Step 3: Cross multiply
    988.52x = 1,366.62 × 865.40
  4. Step 4: Simplify right side
    988.52x = 1,182,672.95
  5. Step 5: Solve for x
    x = 1,182,672.95/988.52
  6. Step 6: Final answer
    x = 1,196.41

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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.