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Finding the Fourth Proportional to 1,223.39, 1,687.58 and 774.44

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Solution

The fourth proportional to 1,223.39, 1,687.58 and 774.44 is: 1,068.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.39 : 1,687.58 = 774.44 : x
  2. Step 2: Convert to fraction form
    1,223.39/1,687.58 = 774.44/x
  3. Step 3: Cross multiply
    1,223.39x = 1,687.58 × 774.44
  4. Step 4: Simplify right side
    1,223.39x = 1,306,917.15
  5. Step 5: Solve for x
    x = 1,306,917.15/1,223.39
  6. Step 6: Final answer
    x = 1,068.28

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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.