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Finding the Fourth Proportional to 548.10, 822.15 and 491.40

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Solution

The fourth proportional to 548.10, 822.15 and 491.40 is: 737.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.10 : 822.15 = 491.40 : x
  2. Step 2: Convert to fraction form
    548.10/822.15 = 491.40/x
  3. Step 3: Cross multiply
    548.10x = 822.15 × 491.40
  4. Step 4: Simplify right side
    548.10x = 404,004.51
  5. Step 5: Solve for x
    x = 404,004.51/548.10
  6. Step 6: Final answer
    x = 737.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.