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Finding the Fourth Proportional to 1,923.20, 2,884.80 and 769.76

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Solution

The fourth proportional to 1,923.20, 2,884.80 and 769.76 is: 1,154.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,923.20 : 2,884.80 = 769.76 : x
  2. Step 2: Convert to fraction form
    1,923.20/2,884.80 = 769.76/x
  3. Step 3: Cross multiply
    1,923.20x = 2,884.80 × 769.76
  4. Step 4: Simplify right side
    1,923.20x = 2,220,603.65
  5. Step 5: Solve for x
    x = 2,220,603.65/1,923.20
  6. Step 6: Final answer
    x = 1,154.64

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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.