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Finding the Fourth Proportional to 836.19, 1,154.52 and 639.36

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Solution

The fourth proportional to 836.19, 1,154.52 and 639.36 is: 882.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.19 : 1,154.52 = 639.36 : x
  2. Step 2: Convert to fraction form
    836.19/1,154.52 = 639.36/x
  3. Step 3: Cross multiply
    836.19x = 1,154.52 × 639.36
  4. Step 4: Simplify right side
    836.19x = 738,153.91
  5. Step 5: Solve for x
    x = 738,153.91/836.19
  6. Step 6: Final answer
    x = 882.76

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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.