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Finding the Fourth Proportional to 836, 1,153.68 and 486.92

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Solution

The fourth proportional to 836, 1,153.68 and 486.92 is: 671.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    836 : 1,153.68 = 486.92 : x
  2. Step 2: Convert to fraction form
    836/1,153.68 = 486.92/x
  3. Step 3: Cross multiply
    836x = 1,153.68 × 486.92
  4. Step 4: Simplify right side
    836x = 561,749.87
  5. Step 5: Solve for x
    x = 561,749.87/836
  6. Step 6: Final answer
    x = 671.95

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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.