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Finding the Fourth Proportional to 1,000.17, 1,379.97 and 641.39

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Solution

The fourth proportional to 1,000.17, 1,379.97 and 641.39 is: 884.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.17 : 1,379.97 = 641.39 : x
  2. Step 2: Convert to fraction form
    1,000.17/1,379.97 = 641.39/x
  3. Step 3: Cross multiply
    1,000.17x = 1,379.97 × 641.39
  4. Step 4: Simplify right side
    1,000.17x = 885,092.06
  5. Step 5: Solve for x
    x = 885,092.06/1,000.17
  6. Step 6: Final answer
    x = 884.94

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1.5x scale

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.