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Finding the Fourth Proportional to 1,151.38, 1,724.32 and 663.40

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Solution

The fourth proportional to 1,151.38, 1,724.32 and 663.40 is: 993.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.38 : 1,724.32 = 663.40 : x
  2. Step 2: Convert to fraction form
    1,151.38/1,724.32 = 663.40/x
  3. Step 3: Cross multiply
    1,151.38x = 1,724.32 × 663.40
  4. Step 4: Simplify right side
    1,151.38x = 1,143,913.89
  5. Step 5: Solve for x
    x = 1,143,913.89/1,151.38
  6. Step 6: Final answer
    x = 993.52

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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.