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Finding the Fourth Proportional to 1,238.50, 1,855.43 and 621.48

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Solution

The fourth proportional to 1,238.50, 1,855.43 and 621.48 is: 931.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.50 : 1,855.43 = 621.48 : x
  2. Step 2: Convert to fraction form
    1,238.50/1,855.43 = 621.48/x
  3. Step 3: Cross multiply
    1,238.50x = 1,855.43 × 621.48
  4. Step 4: Simplify right side
    1,238.50x = 1,153,112.64
  5. Step 5: Solve for x
    x = 1,153,112.64/1,238.50
  6. Step 6: Final answer
    x = 931.06

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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.