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Finding the Fourth Proportional to 808.47, 1,115.19 and 556.83

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Solution

The fourth proportional to 808.47, 1,115.19 and 556.83 is: 768.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.47 : 1,115.19 = 556.83 : x
  2. Step 2: Convert to fraction form
    808.47/1,115.19 = 556.83/x
  3. Step 3: Cross multiply
    808.47x = 1,115.19 × 556.83
  4. Step 4: Simplify right side
    808.47x = 620,971.25
  5. Step 5: Solve for x
    x = 620,971.25/808.47
  6. Step 6: Final answer
    x = 768.08

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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.