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Finding the Fourth Proportional to 808.29, 1,115.97 and 621.45

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Solution

The fourth proportional to 808.29, 1,115.97 and 621.45 is: 858.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.29 : 1,115.97 = 621.45 : x
  2. Step 2: Convert to fraction form
    808.29/1,115.97 = 621.45/x
  3. Step 3: Cross multiply
    808.29x = 1,115.97 × 621.45
  4. Step 4: Simplify right side
    808.29x = 693,520.49
  5. Step 5: Solve for x
    x = 693,520.49/808.29
  6. Step 6: Final answer
    x = 858.01

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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.