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Finding the Fourth Proportional to 587.81, 811.29 and 339.30

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Solution

The fourth proportional to 587.81, 811.29 and 339.30 is: 468.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.81 : 811.29 = 339.30 : x
  2. Step 2: Convert to fraction form
    587.81/811.29 = 339.30/x
  3. Step 3: Cross multiply
    587.81x = 811.29 × 339.30
  4. Step 4: Simplify right side
    587.81x = 275,270.70
  5. Step 5: Solve for x
    x = 275,270.70/587.81
  6. Step 6: Final answer
    x = 468.30

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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.