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Finding the Fourth Proportional to 1,102.21, 1,521.77 and 729.81

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Solution

The fourth proportional to 1,102.21, 1,521.77 and 729.81 is: 1,007.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.21 : 1,521.77 = 729.81 : x
  2. Step 2: Convert to fraction form
    1,102.21/1,521.77 = 729.81/x
  3. Step 3: Cross multiply
    1,102.21x = 1,521.77 × 729.81
  4. Step 4: Simplify right side
    1,102.21x = 1,110,599.31
  5. Step 5: Solve for x
    x = 1,110,599.31/1,102.21
  6. Step 6: Final answer
    x = 1,007.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.