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Finding the Fourth Proportional to 992.61, 1,488.87 and 665.64

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Solution

The fourth proportional to 992.61, 1,488.87 and 665.64 is: 998.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.61 : 1,488.87 = 665.64 : x
  2. Step 2: Convert to fraction form
    992.61/1,488.87 = 665.64/x
  3. Step 3: Cross multiply
    992.61x = 1,488.87 × 665.64
  4. Step 4: Simplify right side
    992.61x = 991,051.43
  5. Step 5: Solve for x
    x = 991,051.43/992.61
  6. Step 6: Final answer
    x = 998.43

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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.