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Finding the Fourth Proportional to 9,720.80, 14,581.20 and 9,634.40

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Solution

The fourth proportional to 9,720.80, 14,581.20 and 9,634.40 is: 14,451.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,720.80 : 14,581.20 = 9,634.40 : x
  2. Step 2: Convert to fraction form
    9,720.80/14,581.20 = 9,634.40/x
  3. Step 3: Cross multiply
    9,720.80x = 14,581.20 × 9,634.40
  4. Step 4: Simplify right side
    9,720.80x = 140,481,113.28
  5. Step 5: Solve for x
    x = 140,481,113.28/9,720.80
  6. Step 6: Final answer
    x = 14,451.60

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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.