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Finding the Fourth Proportional to 587.79, 811.17 and 339.11

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Solution

The fourth proportional to 587.79, 811.17 and 339.11 is: 467.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.79 : 811.17 = 339.11 : x
  2. Step 2: Convert to fraction form
    587.79/811.17 = 339.11/x
  3. Step 3: Cross multiply
    587.79x = 811.17 × 339.11
  4. Step 4: Simplify right side
    587.79x = 275,075.87
  5. Step 5: Solve for x
    x = 275,075.87/587.79
  6. Step 6: Final answer
    x = 467.98

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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.