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Finding the Fourth Proportional to 283.16, 390.49 and 209.66

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Solution

The fourth proportional to 283.16, 390.49 and 209.66 is: 289.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.16 : 390.49 = 209.66 : x
  2. Step 2: Convert to fraction form
    283.16/390.49 = 209.66/x
  3. Step 3: Cross multiply
    283.16x = 390.49 × 209.66
  4. Step 4: Simplify right side
    283.16x = 81,867.66
  5. Step 5: Solve for x
    x = 81,867.66/283.16
  6. Step 6: Final answer
    x = 289.12

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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.