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Finding the Fourth Proportional to 697.81, 1,046.39 and 405.41

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Solution

The fourth proportional to 697.81, 1,046.39 and 405.41 is: 607.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.81 : 1,046.39 = 405.41 : x
  2. Step 2: Convert to fraction form
    697.81/1,046.39 = 405.41/x
  3. Step 3: Cross multiply
    697.81x = 1,046.39 × 405.41
  4. Step 4: Simplify right side
    697.81x = 424,211.23
  5. Step 5: Solve for x
    x = 424,211.23/697.81
  6. Step 6: Final answer
    x = 607.92

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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.