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Finding the Fourth Proportional to 1,471.80, 2,206.56 and 778.56

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Solution

The fourth proportional to 1,471.80, 2,206.56 and 778.56 is: 1,167.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,471.80 : 2,206.56 = 778.56 : x
  2. Step 2: Convert to fraction form
    1,471.80/2,206.56 = 778.56/x
  3. Step 3: Cross multiply
    1,471.80x = 2,206.56 × 778.56
  4. Step 4: Simplify right side
    1,471.80x = 1,717,939.35
  5. Step 5: Solve for x
    x = 1,717,939.35/1,471.80
  6. Step 6: Final answer
    x = 1,167.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.