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Finding the Fourth Proportional to 1,079.96, 1,489.72 and 784.88

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Solution

The fourth proportional to 1,079.96, 1,489.72 and 784.88 is: 1,082.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.96 : 1,489.72 = 784.88 : x
  2. Step 2: Convert to fraction form
    1,079.96/1,489.72 = 784.88/x
  3. Step 3: Cross multiply
    1,079.96x = 1,489.72 × 784.88
  4. Step 4: Simplify right side
    1,079.96x = 1,169,251.43
  5. Step 5: Solve for x
    x = 1,169,251.43/1,079.96
  6. Step 6: Final answer
    x = 1,082.68

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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.