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Finding the Fourth Proportional to 808.80, 1,115.64 and 528.90

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Solution

The fourth proportional to 808.80, 1,115.64 and 528.90 is: 729.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.80 : 1,115.64 = 528.90 : x
  2. Step 2: Convert to fraction form
    808.80/1,115.64 = 528.90/x
  3. Step 3: Cross multiply
    808.80x = 1,115.64 × 528.90
  4. Step 4: Simplify right side
    808.80x = 590,062.00
  5. Step 5: Solve for x
    x = 590,062.00/808.80
  6. Step 6: Final answer
    x = 729.55

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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.