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Finding the Fourth Proportional to 2,439.71, 3,660.07 and 978.98

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Solution

The fourth proportional to 2,439.71, 3,660.07 and 978.98 is: 1,468.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,439.71 : 3,660.07 = 978.98 : x
  2. Step 2: Convert to fraction form
    2,439.71/3,660.07 = 978.98/x
  3. Step 3: Cross multiply
    2,439.71x = 3,660.07 × 978.98
  4. Step 4: Simplify right side
    2,439.71x = 3,583,116.42
  5. Step 5: Solve for x
    x = 3,583,116.42/2,439.71
  6. Step 6: Final answer
    x = 1,468.67

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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.