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Finding the Fourth Proportional to 909.40, 1,366.17 and 786.46

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Solution

The fourth proportional to 909.40, 1,366.17 and 786.46 is: 1,181.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.40 : 1,366.17 = 786.46 : x
  2. Step 2: Convert to fraction form
    909.40/1,366.17 = 786.46/x
  3. Step 3: Cross multiply
    909.40x = 1,366.17 × 786.46
  4. Step 4: Simplify right side
    909.40x = 1,074,438.06
  5. Step 5: Solve for x
    x = 1,074,438.06/909.40
  6. Step 6: Final answer
    x = 1,181.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.