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Finding the Fourth Proportional to 1,439.97, 2,160.40 and 660.31

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Solution

The fourth proportional to 1,439.97, 2,160.40 and 660.31 is: 990.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.97 : 2,160.40 = 660.31 : x
  2. Step 2: Convert to fraction form
    1,439.97/2,160.40 = 660.31/x
  3. Step 3: Cross multiply
    1,439.97x = 2,160.40 × 660.31
  4. Step 4: Simplify right side
    1,439.97x = 1,426,533.72
  5. Step 5: Solve for x
    x = 1,426,533.72/1,439.97
  6. Step 6: Final answer
    x = 990.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.