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Finding the Fourth Proportional to 1,218.20, 1,680.86 and 776.20

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Solution

The fourth proportional to 1,218.20, 1,680.86 and 776.20 is: 1,070.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.20 : 1,680.86 = 776.20 : x
  2. Step 2: Convert to fraction form
    1,218.20/1,680.86 = 776.20/x
  3. Step 3: Cross multiply
    1,218.20x = 1,680.86 × 776.20
  4. Step 4: Simplify right side
    1,218.20x = 1,304,683.53
  5. Step 5: Solve for x
    x = 1,304,683.53/1,218.20
  6. Step 6: Final answer
    x = 1,070.99

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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.