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Finding the Fourth Proportional to 1,471.80, 2,031.10 and 808.72

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Solution

The fourth proportional to 1,471.80, 2,031.10 and 808.72 is: 1,116.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,471.80 : 2,031.10 = 808.72 : x
  2. Step 2: Convert to fraction form
    1,471.80/2,031.10 = 808.72/x
  3. Step 3: Cross multiply
    1,471.80x = 2,031.10 × 808.72
  4. Step 4: Simplify right side
    1,471.80x = 1,642,591.19
  5. Step 5: Solve for x
    x = 1,642,591.19/1,471.80
  6. Step 6: Final answer
    x = 1,116.04

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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.