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Finding the Fourth Proportional to 696.72, 1,045.26 and 331.50

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Solution

The fourth proportional to 696.72, 1,045.26 and 331.50 is: 497.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.72 : 1,045.26 = 331.50 : x
  2. Step 2: Convert to fraction form
    696.72/1,045.26 = 331.50/x
  3. Step 3: Cross multiply
    696.72x = 1,045.26 × 331.50
  4. Step 4: Simplify right side
    696.72x = 346,503.69
  5. Step 5: Solve for x
    x = 346,503.69/696.72
  6. Step 6: Final answer
    x = 497.34

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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.