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Finding the Fourth Proportional to 640.84, 961.48 and 526.54

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Solution

The fourth proportional to 640.84, 961.48 and 526.54 is: 789.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.84 : 961.48 = 526.54 : x
  2. Step 2: Convert to fraction form
    640.84/961.48 = 526.54/x
  3. Step 3: Cross multiply
    640.84x = 961.48 × 526.54
  4. Step 4: Simplify right side
    640.84x = 506,257.68
  5. Step 5: Solve for x
    x = 506,257.68/640.84
  6. Step 6: Final answer
    x = 789.99

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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.