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Finding the Fourth Proportional to 1,265.74, 1,745.20 and 823.48

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Solution

The fourth proportional to 1,265.74, 1,745.20 and 823.48 is: 1,135.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.74 : 1,745.20 = 823.48 : x
  2. Step 2: Convert to fraction form
    1,265.74/1,745.20 = 823.48/x
  3. Step 3: Cross multiply
    1,265.74x = 1,745.20 × 823.48
  4. Step 4: Simplify right side
    1,265.74x = 1,437,137.30
  5. Step 5: Solve for x
    x = 1,437,137.30/1,265.74
  6. Step 6: Final answer
    x = 1,135.41

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1.5x scale

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.