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Finding the Fourth Proportional to 1,326.78, 1,988.91 and 749.70

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Solution

The fourth proportional to 1,326.78, 1,988.91 and 749.70 is: 1,123.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.78 : 1,988.91 = 749.70 : x
  2. Step 2: Convert to fraction form
    1,326.78/1,988.91 = 749.70/x
  3. Step 3: Cross multiply
    1,326.78x = 1,988.91 × 749.70
  4. Step 4: Simplify right side
    1,326.78x = 1,491,085.83
  5. Step 5: Solve for x
    x = 1,491,085.83/1,326.78
  6. Step 6: Final answer
    x = 1,123.84

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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.