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Finding the Fourth Proportional to 836.20, 1,155.90 and 768.16

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Solution

The fourth proportional to 836.20, 1,155.90 and 768.16 is: 1,061.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.20 : 1,155.90 = 768.16 : x
  2. Step 2: Convert to fraction form
    836.20/1,155.90 = 768.16/x
  3. Step 3: Cross multiply
    836.20x = 1,155.90 × 768.16
  4. Step 4: Simplify right side
    836.20x = 887,916.14
  5. Step 5: Solve for x
    x = 887,916.14/836.20
  6. Step 6: Final answer
    x = 1,061.85

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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.