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Finding the Fourth Proportional to 908.75, 1,254.21 and 554.88

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Solution

The fourth proportional to 908.75, 1,254.21 and 554.88 is: 765.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.75 : 1,254.21 = 554.88 : x
  2. Step 2: Convert to fraction form
    908.75/1,254.21 = 554.88/x
  3. Step 3: Cross multiply
    908.75x = 1,254.21 × 554.88
  4. Step 4: Simplify right side
    908.75x = 695,929.65
  5. Step 5: Solve for x
    x = 695,929.65/908.75
  6. Step 6: Final answer
    x = 765.81

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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.