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Finding the Fourth Proportional to 808.61, 1,115.89 and 459.29

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Solution

The fourth proportional to 808.61, 1,115.89 and 459.29 is: 633.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.61 : 1,115.89 = 459.29 : x
  2. Step 2: Convert to fraction form
    808.61/1,115.89 = 459.29/x
  3. Step 3: Cross multiply
    808.61x = 1,115.89 × 459.29
  4. Step 4: Simplify right side
    808.61x = 512,518.76
  5. Step 5: Solve for x
    x = 512,518.76/808.61
  6. Step 6: Final answer
    x = 633.83

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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.