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Finding the Fourth Proportional to 1,439.54, 1,989.03 and 1,110.79

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Solution

The fourth proportional to 1,439.54, 1,989.03 and 1,110.79 is: 1,534.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.54 : 1,989.03 = 1,110.79 : x
  2. Step 2: Convert to fraction form
    1,439.54/1,989.03 = 1,110.79/x
  3. Step 3: Cross multiply
    1,439.54x = 1,989.03 × 1,110.79
  4. Step 4: Simplify right side
    1,439.54x = 2,209,394.63
  5. Step 5: Solve for x
    x = 2,209,394.63/1,439.54
  6. Step 6: Final answer
    x = 1,534.79

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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.