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Finding the Fourth Proportional to 808.75, 1,115.55 and 498.27

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Solution

The fourth proportional to 808.75, 1,115.55 and 498.27 is: 687.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.75 : 1,115.55 = 498.27 : x
  2. Step 2: Convert to fraction form
    808.75/1,115.55 = 498.27/x
  3. Step 3: Cross multiply
    808.75x = 1,115.55 × 498.27
  4. Step 4: Simplify right side
    808.75x = 555,845.10
  5. Step 5: Solve for x
    x = 555,845.10/808.75
  6. Step 6: Final answer
    x = 687.29

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Double scale
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1.5x scale

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.