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Finding the Fourth Proportional to 640.11, 962.30 and 525.40

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Solution

The fourth proportional to 640.11, 962.30 and 525.40 is: 789.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.11 : 962.30 = 525.40 : x
  2. Step 2: Convert to fraction form
    640.11/962.30 = 525.40/x
  3. Step 3: Cross multiply
    640.11x = 962.30 × 525.40
  4. Step 4: Simplify right side
    640.11x = 505,592.42
  5. Step 5: Solve for x
    x = 505,592.42/640.11
  6. Step 6: Final answer
    x = 789.85

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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.