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Finding the Fourth Proportional to 1,101.92, 1,519.06 and 913

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Solution

The fourth proportional to 1,101.92, 1,519.06 and 913 is: 1,258.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.92 : 1,519.06 = 913 : x
  2. Step 2: Convert to fraction form
    1,101.92/1,519.06 = 913/x
  3. Step 3: Cross multiply
    1,101.92x = 1,519.06 × 913
  4. Step 4: Simplify right side
    1,101.92x = 1,386,901.78
  5. Step 5: Solve for x
    x = 1,386,901.78/1,101.92
  6. Step 6: Final answer
    x = 1,258.62

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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.