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Finding the Fourth Proportional to 808.50, 1,115.74 and 440.50

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Solution

The fourth proportional to 808.50, 1,115.74 and 440.50 is: 607.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.50 : 1,115.74 = 440.50 : x
  2. Step 2: Convert to fraction form
    808.50/1,115.74 = 440.50/x
  3. Step 3: Cross multiply
    808.50x = 1,115.74 × 440.50
  4. Step 4: Simplify right side
    808.50x = 491,483.47
  5. Step 5: Solve for x
    x = 491,483.47/808.50
  6. Step 6: Final answer
    x = 607.90

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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.