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Finding the Fourth Proportional to 1,153.73, 1,729.51 and 639.65

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Solution

The fourth proportional to 1,153.73, 1,729.51 and 639.65 is: 958.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.73 : 1,729.51 = 639.65 : x
  2. Step 2: Convert to fraction form
    1,153.73/1,729.51 = 639.65/x
  3. Step 3: Cross multiply
    1,153.73x = 1,729.51 × 639.65
  4. Step 4: Simplify right side
    1,153.73x = 1,106,277.55
  5. Step 5: Solve for x
    x = 1,106,277.55/1,153.73
  6. Step 6: Final answer
    x = 958.87

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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.