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Finding the Fourth Proportional to 2,132.40, 3,199.08 and 978.48

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Solution

The fourth proportional to 2,132.40, 3,199.08 and 978.48 is: 1,467.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,132.40 : 3,199.08 = 978.48 : x
  2. Step 2: Convert to fraction form
    2,132.40/3,199.08 = 978.48/x
  3. Step 3: Cross multiply
    2,132.40x = 3,199.08 × 978.48
  4. Step 4: Simplify right side
    2,132.40x = 3,130,235.80
  5. Step 5: Solve for x
    x = 3,130,235.80/2,132.40
  6. Step 6: Final answer
    x = 1,467.94

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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.