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Finding the Fourth Proportional to 992.54, 1,370.33 and 638.63

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Solution

The fourth proportional to 992.54, 1,370.33 and 638.63 is: 881.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.54 : 1,370.33 = 638.63 : x
  2. Step 2: Convert to fraction form
    992.54/1,370.33 = 638.63/x
  3. Step 3: Cross multiply
    992.54x = 1,370.33 × 638.63
  4. Step 4: Simplify right side
    992.54x = 875,133.85
  5. Step 5: Solve for x
    x = 875,133.85/992.54
  6. Step 6: Final answer
    x = 881.71

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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.