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Finding the Fourth Proportional to 808.20, 1,114.38 and 559.71

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Solution

The fourth proportional to 808.20, 1,114.38 and 559.71 is: 771.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.20 : 1,114.38 = 559.71 : x
  2. Step 2: Convert to fraction form
    808.20/1,114.38 = 559.71/x
  3. Step 3: Cross multiply
    808.20x = 1,114.38 × 559.71
  4. Step 4: Simplify right side
    808.20x = 623,729.63
  5. Step 5: Solve for x
    x = 623,729.63/808.20
  6. Step 6: Final answer
    x = 771.75

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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.