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Finding the Fourth Proportional to 332.61, 458.21 and 318.03

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Solution

The fourth proportional to 332.61, 458.21 and 318.03 is: 438.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    332.61 : 458.21 = 318.03 : x
  2. Step 2: Convert to fraction form
    332.61/458.21 = 318.03/x
  3. Step 3: Cross multiply
    332.61x = 458.21 × 318.03
  4. Step 4: Simplify right side
    332.61x = 145,721.81
  5. Step 5: Solve for x
    x = 145,721.81/332.61
  6. Step 6: Final answer
    x = 438.12

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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.