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Finding the Fourth Proportional to 808.16, 1,115.24 and 528.86

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Solution

The fourth proportional to 808.16, 1,115.24 and 528.86 is: 729.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.16 : 1,115.24 = 528.86 : x
  2. Step 2: Convert to fraction form
    808.16/1,115.24 = 528.86/x
  3. Step 3: Cross multiply
    808.16x = 1,115.24 × 528.86
  4. Step 4: Simplify right side
    808.16x = 589,801.57
  5. Step 5: Solve for x
    x = 589,801.57/808.16
  6. Step 6: Final answer
    x = 729.81

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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.