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Finding the Fourth Proportional to 720.34, 1,079.88 and 611.36

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Solution

The fourth proportional to 720.34, 1,079.88 and 611.36 is: 916.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.34 : 1,079.88 = 611.36 : x
  2. Step 2: Convert to fraction form
    720.34/1,079.88 = 611.36/x
  3. Step 3: Cross multiply
    720.34x = 1,079.88 × 611.36
  4. Step 4: Simplify right side
    720.34x = 660,195.44
  5. Step 5: Solve for x
    x = 660,195.44/720.34
  6. Step 6: Final answer
    x = 916.51

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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.