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Finding the Fourth Proportional to 19,621.20, 29,431.80 and 18,008.40

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Solution

The fourth proportional to 19,621.20, 29,431.80 and 18,008.40 is: 27,012.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,621.20 : 29,431.80 = 18,008.40 : x
  2. Step 2: Convert to fraction form
    19,621.20/29,431.80 = 18,008.40/x
  3. Step 3: Cross multiply
    19,621.20x = 29,431.80 × 18,008.40
  4. Step 4: Simplify right side
    19,621.20x = 530,019,627.12
  5. Step 5: Solve for x
    x = 530,019,627.12/19,621.20
  6. Step 6: Final answer
    x = 27,012.60

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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.