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Finding the Fourth Proportional to 458.16, 632.40 and 318.48

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Solution

The fourth proportional to 458.16, 632.40 and 318.48 is: 439.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.16 : 632.40 = 318.48 : x
  2. Step 2: Convert to fraction form
    458.16/632.40 = 318.48/x
  3. Step 3: Cross multiply
    458.16x = 632.40 × 318.48
  4. Step 4: Simplify right side
    458.16x = 201,406.75
  5. Step 5: Solve for x
    x = 201,406.75/458.16
  6. Step 6: Final answer
    x = 439.60

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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.