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Finding the Fourth Proportional to 1,238.38, 1,857.57 and 507.79

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Solution

The fourth proportional to 1,238.38, 1,857.57 and 507.79 is: 761.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.38 : 1,857.57 = 507.79 : x
  2. Step 2: Convert to fraction form
    1,238.38/1,857.57 = 507.79/x
  3. Step 3: Cross multiply
    1,238.38x = 1,857.57 × 507.79
  4. Step 4: Simplify right side
    1,238.38x = 943,255.47
  5. Step 5: Solve for x
    x = 943,255.47/1,238.38
  6. Step 6: Final answer
    x = 761.69

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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.