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Finding the Fourth Proportional to 1,108.68, 1,529.85 and 636.45

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Solution

The fourth proportional to 1,108.68, 1,529.85 and 636.45 is: 878.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.68 : 1,529.85 = 636.45 : x
  2. Step 2: Convert to fraction form
    1,108.68/1,529.85 = 636.45/x
  3. Step 3: Cross multiply
    1,108.68x = 1,529.85 × 636.45
  4. Step 4: Simplify right side
    1,108.68x = 973,673.03
  5. Step 5: Solve for x
    x = 973,673.03/1,108.68
  6. Step 6: Final answer
    x = 878.23

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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.