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Finding the Fourth Proportional to 696.31, 1,045.49 and 388.76

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Solution

The fourth proportional to 696.31, 1,045.49 and 388.76 is: 583.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.31 : 1,045.49 = 388.76 : x
  2. Step 2: Convert to fraction form
    696.31/1,045.49 = 388.76/x
  3. Step 3: Cross multiply
    696.31x = 1,045.49 × 388.76
  4. Step 4: Simplify right side
    696.31x = 406,442.75
  5. Step 5: Solve for x
    x = 406,442.75/696.31
  6. Step 6: Final answer
    x = 583.71

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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.