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Finding the Fourth Proportional to 1,138.52, 1,711.58 and 934.60

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Solution

The fourth proportional to 1,138.52, 1,711.58 and 934.60 is: 1,405.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.52 : 1,711.58 = 934.60 : x
  2. Step 2: Convert to fraction form
    1,138.52/1,711.58 = 934.60/x
  3. Step 3: Cross multiply
    1,138.52x = 1,711.58 × 934.60
  4. Step 4: Simplify right side
    1,138.52x = 1,599,642.67
  5. Step 5: Solve for x
    x = 1,599,642.67/1,138.52
  6. Step 6: Final answer
    x = 1,405.02

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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.