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Finding the Fourth Proportional to 827.70, 1,240.60 and 417.12

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Solution

The fourth proportional to 827.70, 1,240.60 and 417.12 is: 625.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.70 : 1,240.60 = 417.12 : x
  2. Step 2: Convert to fraction form
    827.70/1,240.60 = 417.12/x
  3. Step 3: Cross multiply
    827.70x = 1,240.60 × 417.12
  4. Step 4: Simplify right side
    827.70x = 517,479.07
  5. Step 5: Solve for x
    x = 517,479.07/827.70
  6. Step 6: Final answer
    x = 625.20

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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.