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Finding the Fourth Proportional to 909.20, 1,254.78 and 516.35

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Solution

The fourth proportional to 909.20, 1,254.78 and 516.35 is: 712.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.20 : 1,254.78 = 516.35 : x
  2. Step 2: Convert to fraction form
    909.20/1,254.78 = 516.35/x
  3. Step 3: Cross multiply
    909.20x = 1,254.78 × 516.35
  4. Step 4: Simplify right side
    909.20x = 647,899.38
  5. Step 5: Solve for x
    x = 647,899.38/909.20
  6. Step 6: Final answer
    x = 712.61

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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.