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Finding the Fourth Proportional to 681.17, 1,019.95 and 548.69

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Solution

The fourth proportional to 681.17, 1,019.95 and 548.69 is: 821.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.17 : 1,019.95 = 548.69 : x
  2. Step 2: Convert to fraction form
    681.17/1,019.95 = 548.69/x
  3. Step 3: Cross multiply
    681.17x = 1,019.95 × 548.69
  4. Step 4: Simplify right side
    681.17x = 559,629.89
  5. Step 5: Solve for x
    x = 559,629.89/681.17
  6. Step 6: Final answer
    x = 821.58

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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.