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Finding the Fourth Proportional to 1,245.54, 1,717.68 and 931.56

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Solution

The fourth proportional to 1,245.54, 1,717.68 and 931.56 is: 1,284.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.54 : 1,717.68 = 931.56 : x
  2. Step 2: Convert to fraction form
    1,245.54/1,717.68 = 931.56/x
  3. Step 3: Cross multiply
    1,245.54x = 1,717.68 × 931.56
  4. Step 4: Simplify right side
    1,245.54x = 1,600,121.98
  5. Step 5: Solve for x
    x = 1,600,121.98/1,245.54
  6. Step 6: Final answer
    x = 1,284.68

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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.