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Finding the Fourth Proportional to 1,210.68, 1,671.18 and 769.20

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Solution

The fourth proportional to 1,210.68, 1,671.18 and 769.20 is: 1,061.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.68 : 1,671.18 = 769.20 : x
  2. Step 2: Convert to fraction form
    1,210.68/1,671.18 = 769.20/x
  3. Step 3: Cross multiply
    1,210.68x = 1,671.18 × 769.20
  4. Step 4: Simplify right side
    1,210.68x = 1,285,471.66
  5. Step 5: Solve for x
    x = 1,285,471.66/1,210.68
  6. Step 6: Final answer
    x = 1,061.78

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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.