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Finding the Fourth Proportional to 587.80, 811.18 and 339.18

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Solution

The fourth proportional to 587.80, 811.18 and 339.18 is: 468.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.80 : 811.18 = 339.18 : x
  2. Step 2: Convert to fraction form
    587.80/811.18 = 339.18/x
  3. Step 3: Cross multiply
    587.80x = 811.18 × 339.18
  4. Step 4: Simplify right side
    587.80x = 275,136.03
  5. Step 5: Solve for x
    x = 275,136.03/587.80
  6. Step 6: Final answer
    x = 468.08

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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.