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Finding the Fourth Proportional to 13,742.40, 20,635.20 and 7,910.40

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Solution

The fourth proportional to 13,742.40, 20,635.20 and 7,910.40 is: 11,878.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,742.40 : 20,635.20 = 7,910.40 : x
  2. Step 2: Convert to fraction form
    13,742.40/20,635.20 = 7,910.40/x
  3. Step 3: Cross multiply
    13,742.40x = 20,635.20 × 7,910.40
  4. Step 4: Simplify right side
    13,742.40x = 163,232,686.08
  5. Step 5: Solve for x
    x = 163,232,686.08/13,742.40
  6. Step 6: Final answer
    x = 11,878.03

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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.