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Finding the Fourth Proportional to 1,471.52, 2,030.72 and 808.40

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Solution

The fourth proportional to 1,471.52, 2,030.72 and 808.40 is: 1,115.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,471.52 : 2,030.72 = 808.40 : x
  2. Step 2: Convert to fraction form
    1,471.52/2,030.72 = 808.40/x
  3. Step 3: Cross multiply
    1,471.52x = 2,030.72 × 808.40
  4. Step 4: Simplify right side
    1,471.52x = 1,641,634.05
  5. Step 5: Solve for x
    x = 1,641,634.05/1,471.52
  6. Step 6: Final answer
    x = 1,115.60

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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.