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Finding the Fourth Proportional to 587.70, 811.35 and 391.56

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Solution

The fourth proportional to 587.70, 811.35 and 391.56 is: 540.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.70 : 811.35 = 391.56 : x
  2. Step 2: Convert to fraction form
    587.70/811.35 = 391.56/x
  3. Step 3: Cross multiply
    587.70x = 811.35 × 391.56
  4. Step 4: Simplify right side
    587.70x = 317,692.21
  5. Step 5: Solve for x
    x = 317,692.21/587.70
  6. Step 6: Final answer
    x = 540.57

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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.