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Finding the Fourth Proportional to 769.92, 1,155.84 and 385.92

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Solution

The fourth proportional to 769.92, 1,155.84 and 385.92 is: 579.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.92 : 1,155.84 = 385.92 : x
  2. Step 2: Convert to fraction form
    769.92/1,155.84 = 385.92/x
  3. Step 3: Cross multiply
    769.92x = 1,155.84 × 385.92
  4. Step 4: Simplify right side
    769.92x = 446,061.77
  5. Step 5: Solve for x
    x = 446,061.77/769.92
  6. Step 6: Final answer
    x = 579.36

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1.5x scale

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.