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Finding the Fourth Proportional to 1,154.78, 1,589.91 and 934.46

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Solution

The fourth proportional to 1,154.78, 1,589.91 and 934.46 is: 1,286.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,154.78 : 1,589.91 = 934.46 : x
  2. Step 2: Convert to fraction form
    1,154.78/1,589.91 = 934.46/x
  3. Step 3: Cross multiply
    1,154.78x = 1,589.91 × 934.46
  4. Step 4: Simplify right side
    1,154.78x = 1,485,707.77
  5. Step 5: Solve for x
    x = 1,485,707.77/1,154.78
  6. Step 6: Final answer
    x = 1,286.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.