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Finding the Fourth Proportional to 1,143.05, 1,715.44 and 752.92

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Solution

The fourth proportional to 1,143.05, 1,715.44 and 752.92 is: 1,129.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.05 : 1,715.44 = 752.92 : x
  2. Step 2: Convert to fraction form
    1,143.05/1,715.44 = 752.92/x
  3. Step 3: Cross multiply
    1,143.05x = 1,715.44 × 752.92
  4. Step 4: Simplify right side
    1,143.05x = 1,291,585.74
  5. Step 5: Solve for x
    x = 1,291,585.74/1,143.05
  6. Step 6: Final answer
    x = 1,129.95

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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.