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Finding the Fourth Proportional to 1,223.12, 1,830.84 and 644.24

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Solution

The fourth proportional to 1,223.12, 1,830.84 and 644.24 is: 964.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.12 : 1,830.84 = 644.24 : x
  2. Step 2: Convert to fraction form
    1,223.12/1,830.84 = 644.24/x
  3. Step 3: Cross multiply
    1,223.12x = 1,830.84 × 644.24
  4. Step 4: Simplify right side
    1,223.12x = 1,179,500.36
  5. Step 5: Solve for x
    x = 1,179,500.36/1,223.12
  6. Step 6: Final answer
    x = 964.34

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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.