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Finding the Fourth Proportional to 1,238.15, 1,857.58 and 690.73

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Solution

The fourth proportional to 1,238.15, 1,857.58 and 690.73 is: 1,036.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.15 : 1,857.58 = 690.73 : x
  2. Step 2: Convert to fraction form
    1,238.15/1,857.58 = 690.73/x
  3. Step 3: Cross multiply
    1,238.15x = 1,857.58 × 690.73
  4. Step 4: Simplify right side
    1,238.15x = 1,283,079.86
  5. Step 5: Solve for x
    x = 1,283,079.86/1,238.15
  6. Step 6: Final answer
    x = 1,036.29

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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.