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Finding the Fourth Proportional to 1,108.94, 1,530.33 and 636.92

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Solution

The fourth proportional to 1,108.94, 1,530.33 and 636.92 is: 878.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.94 : 1,530.33 = 636.92 : x
  2. Step 2: Convert to fraction form
    1,108.94/1,530.33 = 636.92/x
  3. Step 3: Cross multiply
    1,108.94x = 1,530.33 × 636.92
  4. Step 4: Simplify right side
    1,108.94x = 974,697.78
  5. Step 5: Solve for x
    x = 974,697.78/1,108.94
  6. Step 6: Final answer
    x = 878.95

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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.