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Finding the Fourth Proportional to 788.13, 1,182.60 and 422.82

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Solution

The fourth proportional to 788.13, 1,182.60 and 422.82 is: 634.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.13 : 1,182.60 = 422.82 : x
  2. Step 2: Convert to fraction form
    788.13/1,182.60 = 422.82/x
  3. Step 3: Cross multiply
    788.13x = 1,182.60 × 422.82
  4. Step 4: Simplify right side
    788.13x = 500,026.93
  5. Step 5: Solve for x
    x = 500,026.93/788.13
  6. Step 6: Final answer
    x = 634.45

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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.