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Finding the Fourth Proportional to 1,102.81, 1,521.92 and 630.78

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Solution

The fourth proportional to 1,102.81, 1,521.92 and 630.78 is: 870.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.81 : 1,521.92 = 630.78 : x
  2. Step 2: Convert to fraction form
    1,102.81/1,521.92 = 630.78/x
  3. Step 3: Cross multiply
    1,102.81x = 1,521.92 × 630.78
  4. Step 4: Simplify right side
    1,102.81x = 959,996.70
  5. Step 5: Solve for x
    x = 959,996.70/1,102.81
  6. Step 6: Final answer
    x = 870.50

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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.