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Finding the Fourth Proportional to 1,392.17, 1,922.87 and 1,101.29

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Solution

The fourth proportional to 1,392.17, 1,922.87 and 1,101.29 is: 1,521.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.17 : 1,922.87 = 1,101.29 : x
  2. Step 2: Convert to fraction form
    1,392.17/1,922.87 = 1,101.29/x
  3. Step 3: Cross multiply
    1,392.17x = 1,922.87 × 1,101.29
  4. Step 4: Simplify right side
    1,392.17x = 2,117,630.64
  5. Step 5: Solve for x
    x = 2,117,630.64/1,392.17
  6. Step 6: Final answer
    x = 1,521.11

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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.