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Finding the Fourth Proportional to 816.66, 1,127.02 and 779.76

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Solution

The fourth proportional to 816.66, 1,127.02 and 779.76 is: 1,076.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.66 : 1,127.02 = 779.76 : x
  2. Step 2: Convert to fraction form
    816.66/1,127.02 = 779.76/x
  3. Step 3: Cross multiply
    816.66x = 1,127.02 × 779.76
  4. Step 4: Simplify right side
    816.66x = 878,805.12
  5. Step 5: Solve for x
    x = 878,805.12/816.66
  6. Step 6: Final answer
    x = 1,076.10

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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.