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Finding the Fourth Proportional to 19,991.20, 29,990.40 and 8,305.60

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Solution

The fourth proportional to 19,991.20, 29,990.40 and 8,305.60 is: 12,459.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,991.20 : 29,990.40 = 8,305.60 : x
  2. Step 2: Convert to fraction form
    19,991.20/29,990.40 = 8,305.60/x
  3. Step 3: Cross multiply
    19,991.20x = 29,990.40 × 8,305.60
  4. Step 4: Simplify right side
    19,991.20x = 249,088,266.24
  5. Step 5: Solve for x
    x = 249,088,266.24/19,991.20
  6. Step 6: Final answer
    x = 12,459.90

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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.