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Finding the Fourth Proportional to 1,079.19, 1,489.20 and 680.91

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Solution

The fourth proportional to 1,079.19, 1,489.20 and 680.91 is: 939.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.19 : 1,489.20 = 680.91 : x
  2. Step 2: Convert to fraction form
    1,079.19/1,489.20 = 680.91/x
  3. Step 3: Cross multiply
    1,079.19x = 1,489.20 × 680.91
  4. Step 4: Simplify right side
    1,079.19x = 1,014,011.17
  5. Step 5: Solve for x
    x = 1,014,011.17/1,079.19
  6. Step 6: Final answer
    x = 939.60

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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.