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Finding the Fourth Proportional to 720.48, 1,073.87 and 679.47

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Solution

The fourth proportional to 720.48, 1,073.87 and 679.47 is: 1,012.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.48 : 1,073.87 = 679.47 : x
  2. Step 2: Convert to fraction form
    720.48/1,073.87 = 679.47/x
  3. Step 3: Cross multiply
    720.48x = 1,073.87 × 679.47
  4. Step 4: Simplify right side
    720.48x = 729,659.05
  5. Step 5: Solve for x
    x = 729,659.05/720.48
  6. Step 6: Final answer
    x = 1,012.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.