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Finding the Fourth Proportional to 466.15, 643.20 and 316.90

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Solution

The fourth proportional to 466.15, 643.20 and 316.90 is: 437.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    466.15 : 643.20 = 316.90 : x
  2. Step 2: Convert to fraction form
    466.15/643.20 = 316.90/x
  3. Step 3: Cross multiply
    466.15x = 643.20 × 316.90
  4. Step 4: Simplify right side
    466.15x = 203,826.86
  5. Step 5: Solve for x
    x = 203,826.86/466.15
  6. Step 6: Final answer
    x = 437.26

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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.