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Finding the Fourth Proportional to 992.76, 1,369.62 and 638.62

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Solution

The fourth proportional to 992.76, 1,369.62 and 638.62 is: 881.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.76 : 1,369.62 = 638.62 : x
  2. Step 2: Convert to fraction form
    992.76/1,369.62 = 638.62/x
  3. Step 3: Cross multiply
    992.76x = 1,369.62 × 638.62
  4. Step 4: Simplify right side
    992.76x = 874,669.21
  5. Step 5: Solve for x
    x = 874,669.21/992.76
  6. Step 6: Final answer
    x = 881.05

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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.