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Finding the Fourth Proportional to 1,189.13, 1,780.65 and 880.52

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Solution

The fourth proportional to 1,189.13, 1,780.65 and 880.52 is: 1,318.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.13 : 1,780.65 = 880.52 : x
  2. Step 2: Convert to fraction form
    1,189.13/1,780.65 = 880.52/x
  3. Step 3: Cross multiply
    1,189.13x = 1,780.65 × 880.52
  4. Step 4: Simplify right side
    1,189.13x = 1,567,889.03
  5. Step 5: Solve for x
    x = 1,567,889.03/1,189.13
  6. Step 6: Final answer
    x = 1,318.52

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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.