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Finding the Fourth Proportional to 434.85, 655.31 and 391.56

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Solution

The fourth proportional to 434.85, 655.31 and 391.56 is: 590.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.85 : 655.31 = 391.56 : x
  2. Step 2: Convert to fraction form
    434.85/655.31 = 391.56/x
  3. Step 3: Cross multiply
    434.85x = 655.31 × 391.56
  4. Step 4: Simplify right side
    434.85x = 256,591.23
  5. Step 5: Solve for x
    x = 256,591.23/434.85
  6. Step 6: Final answer
    x = 590.07

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.