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Finding the Fourth Proportional to 1,238.90, 1,707.48 and 976.46

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Solution

The fourth proportional to 1,238.90, 1,707.48 and 976.46 is: 1,345.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.90 : 1,707.48 = 976.46 : x
  2. Step 2: Convert to fraction form
    1,238.90/1,707.48 = 976.46/x
  3. Step 3: Cross multiply
    1,238.90x = 1,707.48 × 976.46
  4. Step 4: Simplify right side
    1,238.90x = 1,667,277.38
  5. Step 5: Solve for x
    x = 1,667,277.38/1,238.90
  6. Step 6: Final answer
    x = 1,345.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.