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Finding the Fourth Proportional to 1,203.66, 1,661.72 and 811.22

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Solution

The fourth proportional to 1,203.66, 1,661.72 and 811.22 is: 1,119.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.66 : 1,661.72 = 811.22 : x
  2. Step 2: Convert to fraction form
    1,203.66/1,661.72 = 811.22/x
  3. Step 3: Cross multiply
    1,203.66x = 1,661.72 × 811.22
  4. Step 4: Simplify right side
    1,203.66x = 1,348,008.13
  5. Step 5: Solve for x
    x = 1,348,008.13/1,203.66
  6. Step 6: Final answer
    x = 1,119.92

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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.