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Finding the Fourth Proportional to 697, 961.86 and 421

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Solution

The fourth proportional to 697, 961.86 and 421 is: 580.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    697 : 961.86 = 421 : x
  2. Step 2: Convert to fraction form
    697/961.86 = 421/x
  3. Step 3: Cross multiply
    697x = 961.86 × 421
  4. Step 4: Simplify right side
    697x = 404,943.06
  5. Step 5: Solve for x
    x = 404,943.06/697
  6. Step 6: Final answer
    x = 580.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.