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Finding the Fourth Proportional to 851.06, 1,276.86 and 388.82

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Solution

The fourth proportional to 851.06, 1,276.86 and 388.82 is: 583.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.06 : 1,276.86 = 388.82 : x
  2. Step 2: Convert to fraction form
    851.06/1,276.86 = 388.82/x
  3. Step 3: Cross multiply
    851.06x = 1,276.86 × 388.82
  4. Step 4: Simplify right side
    851.06x = 496,468.71
  5. Step 5: Solve for x
    x = 496,468.71/851.06
  6. Step 6: Final answer
    x = 583.35

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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.