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Finding the Fourth Proportional to 808.68, 1,115.85 and 493.86

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Solution

The fourth proportional to 808.68, 1,115.85 and 493.86 is: 681.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.68 : 1,115.85 = 493.86 : x
  2. Step 2: Convert to fraction form
    808.68/1,115.85 = 493.86/x
  3. Step 3: Cross multiply
    808.68x = 1,115.85 × 493.86
  4. Step 4: Simplify right side
    808.68x = 551,073.68
  5. Step 5: Solve for x
    x = 551,073.68/808.68
  6. Step 6: Final answer
    x = 681.45

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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.