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Finding the Fourth Proportional to 466.47, 643.23 and 318.87

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Solution

The fourth proportional to 466.47, 643.23 and 318.87 is: 439.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    466.47 : 643.23 = 318.87 : x
  2. Step 2: Convert to fraction form
    466.47/643.23 = 318.87/x
  3. Step 3: Cross multiply
    466.47x = 643.23 × 318.87
  4. Step 4: Simplify right side
    466.47x = 205,106.75
  5. Step 5: Solve for x
    x = 205,106.75/466.47
  6. Step 6: Final answer
    x = 439.70

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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.