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Finding the Fourth Proportional to 587.90, 811.39 and 339.31

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Solution

The fourth proportional to 587.90, 811.39 and 339.31 is: 468.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.90 : 811.39 = 339.31 : x
  2. Step 2: Convert to fraction form
    587.90/811.39 = 339.31/x
  3. Step 3: Cross multiply
    587.90x = 811.39 × 339.31
  4. Step 4: Simplify right side
    587.90x = 275,312.15
  5. Step 5: Solve for x
    x = 275,312.15/587.90
  6. Step 6: Final answer
    x = 468.29

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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.