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Finding the Fourth Proportional to 816.05, 1,127.49 and 642.71

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Solution

The fourth proportional to 816.05, 1,127.49 and 642.71 is: 888.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.05 : 1,127.49 = 642.71 : x
  2. Step 2: Convert to fraction form
    816.05/1,127.49 = 642.71/x
  3. Step 3: Cross multiply
    816.05x = 1,127.49 × 642.71
  4. Step 4: Simplify right side
    816.05x = 724,649.10
  5. Step 5: Solve for x
    x = 724,649.10/816.05
  6. Step 6: Final answer
    x = 888.00

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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.