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Finding the Fourth Proportional to 822.91, 1,135.81 and 491.54

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Solution

The fourth proportional to 822.91, 1,135.81 and 491.54 is: 678.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.91 : 1,135.81 = 491.54 : x
  2. Step 2: Convert to fraction form
    822.91/1,135.81 = 491.54/x
  3. Step 3: Cross multiply
    822.91x = 1,135.81 × 491.54
  4. Step 4: Simplify right side
    822.91x = 558,297.66
  5. Step 5: Solve for x
    x = 558,297.66/822.91
  6. Step 6: Final answer
    x = 678.45

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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.