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Finding the Fourth Proportional to 587.80, 811.20 and 325.85

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Solution

The fourth proportional to 587.80, 811.20 and 325.85 is: 449.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.80 : 811.20 = 325.85 : x
  2. Step 2: Convert to fraction form
    587.80/811.20 = 325.85/x
  3. Step 3: Cross multiply
    587.80x = 811.20 × 325.85
  4. Step 4: Simplify right side
    587.80x = 264,329.52
  5. Step 5: Solve for x
    x = 264,329.52/587.80
  6. Step 6: Final answer
    x = 449.70

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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.