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Finding the Fourth Proportional to 1,314.86, 1,969.73 and 765.90

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Solution

The fourth proportional to 1,314.86, 1,969.73 and 765.90 is: 1,147.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.86 : 1,969.73 = 765.90 : x
  2. Step 2: Convert to fraction form
    1,314.86/1,969.73 = 765.90/x
  3. Step 3: Cross multiply
    1,314.86x = 1,969.73 × 765.90
  4. Step 4: Simplify right side
    1,314.86x = 1,508,612.38
  5. Step 5: Solve for x
    x = 1,508,612.38/1,314.86
  6. Step 6: Final answer
    x = 1,147.36

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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.