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Finding the Fourth Proportional to 257.04, 387.18 and 209.52

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Solution

The fourth proportional to 257.04, 387.18 and 209.52 is: 315.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.04 : 387.18 = 209.52 : x
  2. Step 2: Convert to fraction form
    257.04/387.18 = 209.52/x
  3. Step 3: Cross multiply
    257.04x = 387.18 × 209.52
  4. Step 4: Simplify right side
    257.04x = 81,121.95
  5. Step 5: Solve for x
    x = 81,121.95/257.04
  6. Step 6: Final answer
    x = 315.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.