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Finding the Fourth Proportional to 1,121.78, 1,682.68 and 929

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Solution

The fourth proportional to 1,121.78, 1,682.68 and 929 is: 1,393.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.78 : 1,682.68 = 929 : x
  2. Step 2: Convert to fraction form
    1,121.78/1,682.68 = 929/x
  3. Step 3: Cross multiply
    1,121.78x = 1,682.68 × 929
  4. Step 4: Simplify right side
    1,121.78x = 1,563,209.72
  5. Step 5: Solve for x
    x = 1,563,209.72/1,121.78
  6. Step 6: Final answer
    x = 1,393.51

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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.