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Finding the Fourth Proportional to 437.63, 655.34 and 391.19

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Solution

The fourth proportional to 437.63, 655.34 and 391.19 is: 585.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.63 : 655.34 = 391.19 : x
  2. Step 2: Convert to fraction form
    437.63/655.34 = 391.19/x
  3. Step 3: Cross multiply
    437.63x = 655.34 × 391.19
  4. Step 4: Simplify right side
    437.63x = 256,360.50
  5. Step 5: Solve for x
    x = 256,360.50/437.63
  6. Step 6: Final answer
    x = 585.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.