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Finding the Fourth Proportional to 1,180.79, 1,769.50 and 870.20

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Solution

The fourth proportional to 1,180.79, 1,769.50 and 870.20 is: 1,304.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.79 : 1,769.50 = 870.20 : x
  2. Step 2: Convert to fraction form
    1,180.79/1,769.50 = 870.20/x
  3. Step 3: Cross multiply
    1,180.79x = 1,769.50 × 870.20
  4. Step 4: Simplify right side
    1,180.79x = 1,539,818.90
  5. Step 5: Solve for x
    x = 1,539,818.90/1,180.79
  6. Step 6: Final answer
    x = 1,304.06

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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.