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Finding the Fourth Proportional to 811.47, 1,119.11 and 636.51

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Solution

The fourth proportional to 811.47, 1,119.11 and 636.51 is: 877.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.47 : 1,119.11 = 636.51 : x
  2. Step 2: Convert to fraction form
    811.47/1,119.11 = 636.51/x
  3. Step 3: Cross multiply
    811.47x = 1,119.11 × 636.51
  4. Step 4: Simplify right side
    811.47x = 712,321.52
  5. Step 5: Solve for x
    x = 712,321.52/811.47
  6. Step 6: Final answer
    x = 877.82

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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.