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Finding the Fourth Proportional to 1,191.90, 1,785.45 and 757.50

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Solution

The fourth proportional to 1,191.90, 1,785.45 and 757.50 is: 1,134.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.90 : 1,785.45 = 757.50 : x
  2. Step 2: Convert to fraction form
    1,191.90/1,785.45 = 757.50/x
  3. Step 3: Cross multiply
    1,191.90x = 1,785.45 × 757.50
  4. Step 4: Simplify right side
    1,191.90x = 1,352,478.38
  5. Step 5: Solve for x
    x = 1,352,478.38/1,191.90
  6. Step 6: Final answer
    x = 1,134.72

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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.