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Finding the Fourth Proportional to 697.40, 1,045.78 and 481.08

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Solution

The fourth proportional to 697.40, 1,045.78 and 481.08 is: 721.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.40 : 1,045.78 = 481.08 : x
  2. Step 2: Convert to fraction form
    697.40/1,045.78 = 481.08/x
  3. Step 3: Cross multiply
    697.40x = 1,045.78 × 481.08
  4. Step 4: Simplify right side
    697.40x = 503,103.84
  5. Step 5: Solve for x
    x = 503,103.84/697.40
  6. Step 6: Final answer
    x = 721.40

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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.