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Finding the Fourth Proportional to 696.78, 1,045.20 and 234.60

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Solution

The fourth proportional to 696.78, 1,045.20 and 234.60 is: 351.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.78 : 1,045.20 = 234.60 : x
  2. Step 2: Convert to fraction form
    696.78/1,045.20 = 234.60/x
  3. Step 3: Cross multiply
    696.78x = 1,045.20 × 234.60
  4. Step 4: Simplify right side
    696.78x = 245,203.92
  5. Step 5: Solve for x
    x = 245,203.92/696.78
  6. Step 6: Final answer
    x = 351.91

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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.