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Finding the Fourth Proportional to 1,263.15, 1,743.15 and 765.66

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Solution

The fourth proportional to 1,263.15, 1,743.15 and 765.66 is: 1,056.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.15 : 1,743.15 = 765.66 : x
  2. Step 2: Convert to fraction form
    1,263.15/1,743.15 = 765.66/x
  3. Step 3: Cross multiply
    1,263.15x = 1,743.15 × 765.66
  4. Step 4: Simplify right side
    1,263.15x = 1,334,660.23
  5. Step 5: Solve for x
    x = 1,334,660.23/1,263.15
  6. Step 6: Final answer
    x = 1,056.61

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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.