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Finding the Fourth Proportional to 647.27, 969.95 and 318.11

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Solution

The fourth proportional to 647.27, 969.95 and 318.11 is: 476.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.27 : 969.95 = 318.11 : x
  2. Step 2: Convert to fraction form
    647.27/969.95 = 318.11/x
  3. Step 3: Cross multiply
    647.27x = 969.95 × 318.11
  4. Step 4: Simplify right side
    647.27x = 308,546.74
  5. Step 5: Solve for x
    x = 308,546.74/647.27
  6. Step 6: Final answer
    x = 476.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.