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Finding the Fourth Proportional to 1,102.99, 1,649.62 and 639.57

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Solution

The fourth proportional to 1,102.99, 1,649.62 and 639.57 is: 956.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.99 : 1,649.62 = 639.57 : x
  2. Step 2: Convert to fraction form
    1,102.99/1,649.62 = 639.57/x
  3. Step 3: Cross multiply
    1,102.99x = 1,649.62 × 639.57
  4. Step 4: Simplify right side
    1,102.99x = 1,055,042.08
  5. Step 5: Solve for x
    x = 1,055,042.08/1,102.99
  6. Step 6: Final answer
    x = 956.53

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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.