Home / 1,238.13-1,857.62-621.70

Finding the Fourth Proportional to 1,238.13, 1,857.62 and 621.70

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Solution

The fourth proportional to 1,238.13, 1,857.62 and 621.70 is: 932.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.13 : 1,857.62 = 621.70 : x
  2. Step 2: Convert to fraction form
    1,238.13/1,857.62 = 621.70/x
  3. Step 3: Cross multiply
    1,238.13x = 1,857.62 × 621.70
  4. Step 4: Simplify right side
    1,238.13x = 1,154,879.26
  5. Step 5: Solve for x
    x = 1,154,879.26/1,238.13
  6. Step 6: Final answer
    x = 932.76

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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.