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Finding the Fourth Proportional to 822.84, 1,135.56 and 491.32

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Solution

The fourth proportional to 822.84, 1,135.56 and 491.32 is: 678.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.84 : 1,135.56 = 491.32 : x
  2. Step 2: Convert to fraction form
    822.84/1,135.56 = 491.32/x
  3. Step 3: Cross multiply
    822.84x = 1,135.56 × 491.32
  4. Step 4: Simplify right side
    822.84x = 557,923.34
  5. Step 5: Solve for x
    x = 557,923.34/822.84
  6. Step 6: Final answer
    x = 678.05

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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.