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Finding the Fourth Proportional to 1,059.35, 1,462.19 and 639.71

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Solution

The fourth proportional to 1,059.35, 1,462.19 and 639.71 is: 882.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,059.35 : 1,462.19 = 639.71 : x
  2. Step 2: Convert to fraction form
    1,059.35/1,462.19 = 639.71/x
  3. Step 3: Cross multiply
    1,059.35x = 1,462.19 × 639.71
  4. Step 4: Simplify right side
    1,059.35x = 935,377.56
  5. Step 5: Solve for x
    x = 935,377.56/1,059.35
  6. Step 6: Final answer
    x = 882.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.