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Finding the Fourth Proportional to 318.24, 476.88 and 209.64

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Solution

The fourth proportional to 318.24, 476.88 and 209.64 is: 314.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.24 : 476.88 = 209.64 : x
  2. Step 2: Convert to fraction form
    318.24/476.88 = 209.64/x
  3. Step 3: Cross multiply
    318.24x = 476.88 × 209.64
  4. Step 4: Simplify right side
    318.24x = 99,973.12
  5. Step 5: Solve for x
    x = 99,973.12/318.24
  6. Step 6: Final answer
    x = 314.14

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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.