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Finding the Fourth Proportional to 457.79, 631.35 and 394.85

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Solution

The fourth proportional to 457.79, 631.35 and 394.85 is: 544.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.79 : 631.35 = 394.85 : x
  2. Step 2: Convert to fraction form
    457.79/631.35 = 394.85/x
  3. Step 3: Cross multiply
    457.79x = 631.35 × 394.85
  4. Step 4: Simplify right side
    457.79x = 249,290.13
  5. Step 5: Solve for x
    x = 249,290.13/457.79
  6. Step 6: Final answer
    x = 544.56

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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.