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Finding the Fourth Proportional to 1,015.76, 1,516.42 and 979.76

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Solution

The fourth proportional to 1,015.76, 1,516.42 and 979.76 is: 1,462.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.76 : 1,516.42 = 979.76 : x
  2. Step 2: Convert to fraction form
    1,015.76/1,516.42 = 979.76/x
  3. Step 3: Cross multiply
    1,015.76x = 1,516.42 × 979.76
  4. Step 4: Simplify right side
    1,015.76x = 1,485,727.66
  5. Step 5: Solve for x
    x = 1,485,727.66/1,015.76
  6. Step 6: Final answer
    x = 1,462.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.