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Finding the Fourth Proportional to 1,191.40, 1,789.02 and 678.76

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Solution

The fourth proportional to 1,191.40, 1,789.02 and 678.76 is: 1,019.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.40 : 1,789.02 = 678.76 : x
  2. Step 2: Convert to fraction form
    1,191.40/1,789.02 = 678.76/x
  3. Step 3: Cross multiply
    1,191.40x = 1,789.02 × 678.76
  4. Step 4: Simplify right side
    1,191.40x = 1,214,315.22
  5. Step 5: Solve for x
    x = 1,214,315.22/1,191.40
  6. Step 6: Final answer
    x = 1,019.23

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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.