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Finding the Fourth Proportional to 1,471.76, 2,031.04 and 808.60

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Solution

The fourth proportional to 1,471.76, 2,031.04 and 808.60 is: 1,115.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,471.76 : 2,031.04 = 808.60 : x
  2. Step 2: Convert to fraction form
    1,471.76/2,031.04 = 808.60/x
  3. Step 3: Cross multiply
    1,471.76x = 2,031.04 × 808.60
  4. Step 4: Simplify right side
    1,471.76x = 1,642,284.75
  5. Step 5: Solve for x
    x = 1,642,284.75/1,471.76
  6. Step 6: Final answer
    x = 1,115.86

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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.