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Finding the Fourth Proportional to 908.76, 1,254.09 and 515.78

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Solution

The fourth proportional to 908.76, 1,254.09 and 515.78 is: 711.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.76 : 1,254.09 = 515.78 : x
  2. Step 2: Convert to fraction form
    908.76/1,254.09 = 515.78/x
  3. Step 3: Cross multiply
    908.76x = 1,254.09 × 515.78
  4. Step 4: Simplify right side
    908.76x = 646,833.25
  5. Step 5: Solve for x
    x = 646,833.25/908.76
  6. Step 6: Final answer
    x = 711.78

Related Problems

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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.