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Finding the Fourth Proportional to 642.18, 881.01 and 611.19

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Solution

The fourth proportional to 642.18, 881.01 and 611.19 is: 838.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.18 : 881.01 = 611.19 : x
  2. Step 2: Convert to fraction form
    642.18/881.01 = 611.19/x
  3. Step 3: Cross multiply
    642.18x = 881.01 × 611.19
  4. Step 4: Simplify right side
    642.18x = 538,464.50
  5. Step 5: Solve for x
    x = 538,464.50/642.18
  6. Step 6: Final answer
    x = 838.49

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.