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Finding the Fourth Proportional to 720.71, 1,081.49 and 558.71

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Solution

The fourth proportional to 720.71, 1,081.49 and 558.71 is: 838.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.71 : 1,081.49 = 558.71 : x
  2. Step 2: Convert to fraction form
    720.71/1,081.49 = 558.71/x
  3. Step 3: Cross multiply
    720.71x = 1,081.49 × 558.71
  4. Step 4: Simplify right side
    720.71x = 604,231.08
  5. Step 5: Solve for x
    x = 604,231.08/720.71
  6. Step 6: Final answer
    x = 838.39

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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.