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Finding the Fourth Proportional to 992.32, 1,370 and 638.44

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Solution

The fourth proportional to 992.32, 1,370 and 638.44 is: 881.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.32 : 1,370 = 638.44 : x
  2. Step 2: Convert to fraction form
    992.32/1,370 = 638.44/x
  3. Step 3: Cross multiply
    992.32x = 1,370 × 638.44
  4. Step 4: Simplify right side
    992.32x = 874,662.80
  5. Step 5: Solve for x
    x = 874,662.80/992.32
  6. Step 6: Final answer
    x = 881.43

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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.