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Finding the Fourth Proportional to 827.07, 1,240.25 and 279.11

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Solution

The fourth proportional to 827.07, 1,240.25 and 279.11 is: 418.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.07 : 1,240.25 = 279.11 : x
  2. Step 2: Convert to fraction form
    827.07/1,240.25 = 279.11/x
  3. Step 3: Cross multiply
    827.07x = 1,240.25 × 279.11
  4. Step 4: Simplify right side
    827.07x = 346,158.58
  5. Step 5: Solve for x
    x = 346,158.58/827.07
  6. Step 6: Final answer
    x = 418.54

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Half scale
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Double scale
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1.5x scale

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.