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Finding the Fourth Proportional to 885.51, 1,329.12 and 640.89

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Solution

The fourth proportional to 885.51, 1,329.12 and 640.89 is: 961.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.51 : 1,329.12 = 640.89 : x
  2. Step 2: Convert to fraction form
    885.51/1,329.12 = 640.89/x
  3. Step 3: Cross multiply
    885.51x = 1,329.12 × 640.89
  4. Step 4: Simplify right side
    885.51x = 851,819.72
  5. Step 5: Solve for x
    x = 851,819.72/885.51
  6. Step 6: Final answer
    x = 961.95

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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.