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Finding the Fourth Proportional to 1,679.68, 2,318.24 and 981.44

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Solution

The fourth proportional to 1,679.68, 2,318.24 and 981.44 is: 1,354.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.68 : 2,318.24 = 981.44 : x
  2. Step 2: Convert to fraction form
    1,679.68/2,318.24 = 981.44/x
  3. Step 3: Cross multiply
    1,679.68x = 2,318.24 × 981.44
  4. Step 4: Simplify right side
    1,679.68x = 2,275,213.47
  5. Step 5: Solve for x
    x = 2,275,213.47/1,679.68
  6. Step 6: Final answer
    x = 1,354.55

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1.5x scale

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.