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Finding the Fourth Proportional to 2,770.65, 4,155.84 and 921.69

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Solution

The fourth proportional to 2,770.65, 4,155.84 and 921.69 is: 1,382.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,770.65 : 4,155.84 = 921.69 : x
  2. Step 2: Convert to fraction form
    2,770.65/4,155.84 = 921.69/x
  3. Step 3: Cross multiply
    2,770.65x = 4,155.84 × 921.69
  4. Step 4: Simplify right side
    2,770.65x = 3,830,396.17
  5. Step 5: Solve for x
    x = 3,830,396.17/2,770.65
  6. Step 6: Final answer
    x = 1,382.49

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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.