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Finding the Fourth Proportional to 1,102.90, 1,521.71 and 660.49

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Solution

The fourth proportional to 1,102.90, 1,521.71 and 660.49 is: 911.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.90 : 1,521.71 = 660.49 : x
  2. Step 2: Convert to fraction form
    1,102.90/1,521.71 = 660.49/x
  3. Step 3: Cross multiply
    1,102.90x = 1,521.71 × 660.49
  4. Step 4: Simplify right side
    1,102.90x = 1,005,066.63
  5. Step 5: Solve for x
    x = 1,005,066.63/1,102.90
  6. Step 6: Final answer
    x = 911.30

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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.