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Finding the Fourth Proportional to 836.64, 1,155 and 649.71

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Solution

The fourth proportional to 836.64, 1,155 and 649.71 is: 896.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.64 : 1,155 = 649.71 : x
  2. Step 2: Convert to fraction form
    836.64/1,155 = 649.71/x
  3. Step 3: Cross multiply
    836.64x = 1,155 × 649.71
  4. Step 4: Simplify right side
    836.64x = 750,415.05
  5. Step 5: Solve for x
    x = 750,415.05/836.64
  6. Step 6: Final answer
    x = 896.94

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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.