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Finding the Fourth Proportional to 642.94, 887.46 and 381.04

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Solution

The fourth proportional to 642.94, 887.46 and 381.04 is: 525.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.94 : 887.46 = 381.04 : x
  2. Step 2: Convert to fraction form
    642.94/887.46 = 381.04/x
  3. Step 3: Cross multiply
    642.94x = 887.46 × 381.04
  4. Step 4: Simplify right side
    642.94x = 338,157.76
  5. Step 5: Solve for x
    x = 338,157.76/642.94
  6. Step 6: Final answer
    x = 525.96

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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.