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Finding the Fourth Proportional to 697.89, 1,040.74 and 611.62

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Solution

The fourth proportional to 697.89, 1,040.74 and 611.62 is: 912.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.89 : 1,040.74 = 611.62 : x
  2. Step 2: Convert to fraction form
    697.89/1,040.74 = 611.62/x
  3. Step 3: Cross multiply
    697.89x = 1,040.74 × 611.62
  4. Step 4: Simplify right side
    697.89x = 636,537.40
  5. Step 5: Solve for x
    x = 636,537.40/697.89
  6. Step 6: Final answer
    x = 912.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.