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Finding the Fourth Proportional to 457.22, 631.11 and 315.51

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Solution

The fourth proportional to 457.22, 631.11 and 315.51 is: 435.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.22 : 631.11 = 315.51 : x
  2. Step 2: Convert to fraction form
    457.22/631.11 = 315.51/x
  3. Step 3: Cross multiply
    457.22x = 631.11 × 315.51
  4. Step 4: Simplify right side
    457.22x = 199,118.36
  5. Step 5: Solve for x
    x = 199,118.36/457.22
  6. Step 6: Final answer
    x = 435.50

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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.