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Finding the Fourth Proportional to 788.90, 1,190.48 and 765.81

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Solution

The fourth proportional to 788.90, 1,190.48 and 765.81 is: 1,155.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.90 : 1,190.48 = 765.81 : x
  2. Step 2: Convert to fraction form
    788.90/1,190.48 = 765.81/x
  3. Step 3: Cross multiply
    788.90x = 1,190.48 × 765.81
  4. Step 4: Simplify right side
    788.90x = 911,677.66
  5. Step 5: Solve for x
    x = 911,677.66/788.90
  6. Step 6: Final answer
    x = 1,155.64

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.