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Finding the Fourth Proportional to 992.80, 1,488.18 and 668.26

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Solution

The fourth proportional to 992.80, 1,488.18 and 668.26 is: 1,001.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.80 : 1,488.18 = 668.26 : x
  2. Step 2: Convert to fraction form
    992.80/1,488.18 = 668.26/x
  3. Step 3: Cross multiply
    992.80x = 1,488.18 × 668.26
  4. Step 4: Simplify right side
    992.80x = 994,491.17
  5. Step 5: Solve for x
    x = 994,491.17/992.80
  6. Step 6: Final answer
    x = 1,001.70

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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.