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Finding the Fourth Proportional to 912.87, 1,261.98 and 765.45

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Solution

The fourth proportional to 912.87, 1,261.98 and 765.45 is: 1,058.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.87 : 1,261.98 = 765.45 : x
  2. Step 2: Convert to fraction form
    912.87/1,261.98 = 765.45/x
  3. Step 3: Cross multiply
    912.87x = 1,261.98 × 765.45
  4. Step 4: Simplify right side
    912.87x = 965,982.59
  5. Step 5: Solve for x
    x = 965,982.59/912.87
  6. Step 6: Final answer
    x = 1,058.18

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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.