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Finding the Fourth Proportional to 437.76, 655.92 and 315.72

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Solution

The fourth proportional to 437.76, 655.92 and 315.72 is: 473.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.76 : 655.92 = 315.72 : x
  2. Step 2: Convert to fraction form
    437.76/655.92 = 315.72/x
  3. Step 3: Cross multiply
    437.76x = 655.92 × 315.72
  4. Step 4: Simplify right side
    437.76x = 207,087.06
  5. Step 5: Solve for x
    x = 207,087.06/437.76
  6. Step 6: Final answer
    x = 473.06

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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.