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Finding the Fourth Proportional to 1,101.72, 1,520.30 and 839.28

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Solution

The fourth proportional to 1,101.72, 1,520.30 and 839.28 is: 1,158.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.72 : 1,520.30 = 839.28 : x
  2. Step 2: Convert to fraction form
    1,101.72/1,520.30 = 839.28/x
  3. Step 3: Cross multiply
    1,101.72x = 1,520.30 × 839.28
  4. Step 4: Simplify right side
    1,101.72x = 1,275,953.19
  5. Step 5: Solve for x
    x = 1,275,953.19/1,101.72
  6. Step 6: Final answer
    x = 1,158.15

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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.