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Finding the Fourth Proportional to 836.46, 1,153.62 and 688.74

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Solution

The fourth proportional to 836.46, 1,153.62 and 688.74 is: 949.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.46 : 1,153.62 = 688.74 : x
  2. Step 2: Convert to fraction form
    836.46/1,153.62 = 688.74/x
  3. Step 3: Cross multiply
    836.46x = 1,153.62 × 688.74
  4. Step 4: Simplify right side
    836.46x = 794,544.24
  5. Step 5: Solve for x
    x = 794,544.24/836.46
  6. Step 6: Final answer
    x = 949.89

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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.