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Finding the Fourth Proportional to 992.30, 1,368.74 and 642.96

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Solution

The fourth proportional to 992.30, 1,368.74 and 642.96 is: 886.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.30 : 1,368.74 = 642.96 : x
  2. Step 2: Convert to fraction form
    992.30/1,368.74 = 642.96/x
  3. Step 3: Cross multiply
    992.30x = 1,368.74 × 642.96
  4. Step 4: Simplify right side
    992.30x = 880,046.68
  5. Step 5: Solve for x
    x = 880,046.68/992.30
  6. Step 6: Final answer
    x = 886.88

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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.