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Finding the Fourth Proportional to 696.12, 1,038.46 and 644.52

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Solution

The fourth proportional to 696.12, 1,038.46 and 644.52 is: 961.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.12 : 1,038.46 = 644.52 : x
  2. Step 2: Convert to fraction form
    696.12/1,038.46 = 644.52/x
  3. Step 3: Cross multiply
    696.12x = 1,038.46 × 644.52
  4. Step 4: Simplify right side
    696.12x = 669,308.24
  5. Step 5: Solve for x
    x = 669,308.24/696.12
  6. Step 6: Final answer
    x = 961.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.