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Finding the Fourth Proportional to 827.88, 1,240.75 and 307.40

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Solution

The fourth proportional to 827.88, 1,240.75 and 307.40 is: 460.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.88 : 1,240.75 = 307.40 : x
  2. Step 2: Convert to fraction form
    827.88/1,240.75 = 307.40/x
  3. Step 3: Cross multiply
    827.88x = 1,240.75 × 307.40
  4. Step 4: Simplify right side
    827.88x = 381,408.88
  5. Step 5: Solve for x
    x = 381,408.88/827.88
  6. Step 6: Final answer
    x = 460.71

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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.