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Finding the Fourth Proportional to 19,612.80, 29,419.20 and 11,318.40

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Solution

The fourth proportional to 19,612.80, 29,419.20 and 11,318.40 is: 16,977.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,612.80 : 29,419.20 = 11,318.40 : x
  2. Step 2: Convert to fraction form
    19,612.80/29,419.20 = 11,318.40/x
  3. Step 3: Cross multiply
    19,612.80x = 29,419.20 × 11,318.40
  4. Step 4: Simplify right side
    19,612.80x = 332,978,273.28
  5. Step 5: Solve for x
    x = 332,978,273.28/19,612.80
  6. Step 6: Final answer
    x = 16,977.60

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1.5x scale

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.