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Finding the Fourth Proportional to 697.40, 1,046.86 and 405.23

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Solution

The fourth proportional to 697.40, 1,046.86 and 405.23 is: 608.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.40 : 1,046.86 = 405.23 : x
  2. Step 2: Convert to fraction form
    697.40/1,046.86 = 405.23/x
  3. Step 3: Cross multiply
    697.40x = 1,046.86 × 405.23
  4. Step 4: Simplify right side
    697.40x = 424,214.99
  5. Step 5: Solve for x
    x = 424,214.99/697.40
  6. Step 6: Final answer
    x = 608.28

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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.