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Finding the Fourth Proportional to 1,221.64, 1,685.28 and 801.82

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Solution

The fourth proportional to 1,221.64, 1,685.28 and 801.82 is: 1,106.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.64 : 1,685.28 = 801.82 : x
  2. Step 2: Convert to fraction form
    1,221.64/1,685.28 = 801.82/x
  3. Step 3: Cross multiply
    1,221.64x = 1,685.28 × 801.82
  4. Step 4: Simplify right side
    1,221.64x = 1,351,291.21
  5. Step 5: Solve for x
    x = 1,351,291.21/1,221.64
  6. Step 6: Final answer
    x = 1,106.13

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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.