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Finding the Fourth Proportional to 457.21, 631.50 and 346.65

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Solution

The fourth proportional to 457.21, 631.50 and 346.65 is: 478.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.21 : 631.50 = 346.65 : x
  2. Step 2: Convert to fraction form
    457.21/631.50 = 346.65/x
  3. Step 3: Cross multiply
    457.21x = 631.50 × 346.65
  4. Step 4: Simplify right side
    457.21x = 218,909.48
  5. Step 5: Solve for x
    x = 218,909.48/457.21
  6. Step 6: Final answer
    x = 478.79

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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.