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Finding the Fourth Proportional to 314.46, 433.80 and 209.61

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Solution

The fourth proportional to 314.46, 433.80 and 209.61 is: 289.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.46 : 433.80 = 209.61 : x
  2. Step 2: Convert to fraction form
    314.46/433.80 = 209.61/x
  3. Step 3: Cross multiply
    314.46x = 433.80 × 209.61
  4. Step 4: Simplify right side
    314.46x = 90,928.82
  5. Step 5: Solve for x
    x = 90,928.82/314.46
  6. Step 6: Final answer
    x = 289.16

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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.