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Finding the Fourth Proportional to 698.80, 964.20 and 404.08

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Solution

The fourth proportional to 698.80, 964.20 and 404.08 is: 557.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.80 : 964.20 = 404.08 : x
  2. Step 2: Convert to fraction form
    698.80/964.20 = 404.08/x
  3. Step 3: Cross multiply
    698.80x = 964.20 × 404.08
  4. Step 4: Simplify right side
    698.80x = 389,613.94
  5. Step 5: Solve for x
    x = 389,613.94/698.80
  6. Step 6: Final answer
    x = 557.55

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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.