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Finding the Fourth Proportional to 466.32, 643.58 and 318.90

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Solution

The fourth proportional to 466.32, 643.58 and 318.90 is: 440.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    466.32 : 643.58 = 318.90 : x
  2. Step 2: Convert to fraction form
    466.32/643.58 = 318.90/x
  3. Step 3: Cross multiply
    466.32x = 643.58 × 318.90
  4. Step 4: Simplify right side
    466.32x = 205,237.66
  5. Step 5: Solve for x
    x = 205,237.66/466.32
  6. Step 6: Final answer
    x = 440.12

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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.