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Finding the Fourth Proportional to 1,073.57, 1,610.96 and 639.81

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Solution

The fourth proportional to 1,073.57, 1,610.96 and 639.81 is: 960.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,073.57 : 1,610.96 = 639.81 : x
  2. Step 2: Convert to fraction form
    1,073.57/1,610.96 = 639.81/x
  3. Step 3: Cross multiply
    1,073.57x = 1,610.96 × 639.81
  4. Step 4: Simplify right side
    1,073.57x = 1,030,712.35
  5. Step 5: Solve for x
    x = 1,030,712.35/1,073.57
  6. Step 6: Final answer
    x = 960.08

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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.