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Finding the Fourth Proportional to 642.18, 963.27 and 577.38

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Solution

The fourth proportional to 642.18, 963.27 and 577.38 is: 866.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.18 : 963.27 = 577.38 : x
  2. Step 2: Convert to fraction form
    642.18/963.27 = 577.38/x
  3. Step 3: Cross multiply
    642.18x = 963.27 × 577.38
  4. Step 4: Simplify right side
    642.18x = 556,172.83
  5. Step 5: Solve for x
    x = 556,172.83/642.18
  6. Step 6: Final answer
    x = 866.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.