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Finding the Fourth Proportional to 827.18, 1,235.56 and 620.66

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Solution

The fourth proportional to 827.18, 1,235.56 and 620.66 is: 927.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.18 : 1,235.56 = 620.66 : x
  2. Step 2: Convert to fraction form
    827.18/1,235.56 = 620.66/x
  3. Step 3: Cross multiply
    827.18x = 1,235.56 × 620.66
  4. Step 4: Simplify right side
    827.18x = 766,862.67
  5. Step 5: Solve for x
    x = 766,862.67/827.18
  6. Step 6: Final answer
    x = 927.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.