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Finding the Fourth Proportional to 1,247.87, 1,721.59 and 775.51

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Solution

The fourth proportional to 1,247.87, 1,721.59 and 775.51 is: 1,069.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.87 : 1,721.59 = 775.51 : x
  2. Step 2: Convert to fraction form
    1,247.87/1,721.59 = 775.51/x
  3. Step 3: Cross multiply
    1,247.87x = 1,721.59 × 775.51
  4. Step 4: Simplify right side
    1,247.87x = 1,335,104.02
  5. Step 5: Solve for x
    x = 1,335,104.02/1,247.87
  6. Step 6: Final answer
    x = 1,069.90

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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.