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Finding the Fourth Proportional to 1,471.24, 2,207.10 and 978.76

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Solution

The fourth proportional to 1,471.24, 2,207.10 and 978.76 is: 1,468.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,471.24 : 2,207.10 = 978.76 : x
  2. Step 2: Convert to fraction form
    1,471.24/2,207.10 = 978.76/x
  3. Step 3: Cross multiply
    1,471.24x = 2,207.10 × 978.76
  4. Step 4: Simplify right side
    1,471.24x = 2,160,221.20
  5. Step 5: Solve for x
    x = 2,160,221.20/1,471.24
  6. Step 6: Final answer
    x = 1,468.30

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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.