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Finding the Fourth Proportional to 822.76, 1,135.36 and 491.32

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Solution

The fourth proportional to 822.76, 1,135.36 and 491.32 is: 677.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.76 : 1,135.36 = 491.32 : x
  2. Step 2: Convert to fraction form
    822.76/1,135.36 = 491.32/x
  3. Step 3: Cross multiply
    822.76x = 1,135.36 × 491.32
  4. Step 4: Simplify right side
    822.76x = 557,825.08
  5. Step 5: Solve for x
    x = 557,825.08/822.76
  6. Step 6: Final answer
    x = 677.99

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Double scale
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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.