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Finding the Fourth Proportional to 992.19, 1,369.62 and 638.49

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Solution

The fourth proportional to 992.19, 1,369.62 and 638.49 is: 881.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.19 : 1,369.62 = 638.49 : x
  2. Step 2: Convert to fraction form
    992.19/1,369.62 = 638.49/x
  3. Step 3: Cross multiply
    992.19x = 1,369.62 × 638.49
  4. Step 4: Simplify right side
    992.19x = 874,488.67
  5. Step 5: Solve for x
    x = 874,488.67/992.19
  6. Step 6: Final answer
    x = 881.37

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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.