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Finding the Fourth Proportional to 1,245.15, 1,868.88 and 629.29

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Solution

The fourth proportional to 1,245.15, 1,868.88 and 629.29 is: 944.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.15 : 1,868.88 = 629.29 : x
  2. Step 2: Convert to fraction form
    1,245.15/1,868.88 = 629.29/x
  3. Step 3: Cross multiply
    1,245.15x = 1,868.88 × 629.29
  4. Step 4: Simplify right side
    1,245.15x = 1,176,055.00
  5. Step 5: Solve for x
    x = 1,176,055.00/1,245.15
  6. Step 6: Final answer
    x = 944.51

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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.