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Finding the Fourth Proportional to 457.76, 631.82 and 308.40

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Solution

The fourth proportional to 457.76, 631.82 and 308.40 is: 425.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.76 : 631.82 = 308.40 : x
  2. Step 2: Convert to fraction form
    457.76/631.82 = 308.40/x
  3. Step 3: Cross multiply
    457.76x = 631.82 × 308.40
  4. Step 4: Simplify right side
    457.76x = 194,851.75
  5. Step 5: Solve for x
    x = 194,851.75/457.76
  6. Step 6: Final answer
    x = 425.67

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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.