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Finding the Fourth Proportional to 908.91, 1,254.30 and 554.69

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Solution

The fourth proportional to 908.91, 1,254.30 and 554.69 is: 765.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.91 : 1,254.30 = 554.69 : x
  2. Step 2: Convert to fraction form
    908.91/1,254.30 = 554.69/x
  3. Step 3: Cross multiply
    908.91x = 1,254.30 × 554.69
  4. Step 4: Simplify right side
    908.91x = 695,747.67
  5. Step 5: Solve for x
    x = 695,747.67/908.91
  6. Step 6: Final answer
    x = 765.47

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Half scale
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Double scale
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1.5x scale

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.