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Finding the Fourth Proportional to 458.48, 632.55 and 318.68

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Solution

The fourth proportional to 458.48, 632.55 and 318.68 is: 439.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.48 : 632.55 = 318.68 : x
  2. Step 2: Convert to fraction form
    458.48/632.55 = 318.68/x
  3. Step 3: Cross multiply
    458.48x = 632.55 × 318.68
  4. Step 4: Simplify right side
    458.48x = 201,581.03
  5. Step 5: Solve for x
    x = 201,581.03/458.48
  6. Step 6: Final answer
    x = 439.67

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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.