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Finding the Fourth Proportional to 909.48, 1,254.31 and 768.38

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Solution

The fourth proportional to 909.48, 1,254.31 and 768.38 is: 1,059.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.48 : 1,254.31 = 768.38 : x
  2. Step 2: Convert to fraction form
    909.48/1,254.31 = 768.38/x
  3. Step 3: Cross multiply
    909.48x = 1,254.31 × 768.38
  4. Step 4: Simplify right side
    909.48x = 963,786.72
  5. Step 5: Solve for x
    x = 963,786.72/909.48
  6. Step 6: Final answer
    x = 1,059.71

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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.