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Finding the Fourth Proportional to 808.63, 1,115.90 and 498.13

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Solution

The fourth proportional to 808.63, 1,115.90 and 498.13 is: 687.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.63 : 1,115.90 = 498.13 : x
  2. Step 2: Convert to fraction form
    808.63/1,115.90 = 498.13/x
  3. Step 3: Cross multiply
    808.63x = 1,115.90 × 498.13
  4. Step 4: Simplify right side
    808.63x = 555,863.27
  5. Step 5: Solve for x
    x = 555,863.27/808.63
  6. Step 6: Final answer
    x = 687.41

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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.