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Finding the Fourth Proportional to 851.13, 1,276.29 and 388.62

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Solution

The fourth proportional to 851.13, 1,276.29 and 388.62 is: 582.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.13 : 1,276.29 = 388.62 : x
  2. Step 2: Convert to fraction form
    851.13/1,276.29 = 388.62/x
  3. Step 3: Cross multiply
    851.13x = 1,276.29 × 388.62
  4. Step 4: Simplify right side
    851.13x = 495,991.82
  5. Step 5: Solve for x
    x = 495,991.82/851.13
  6. Step 6: Final answer
    x = 582.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.