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Finding the Fourth Proportional to 13,740.40, 20,596.20 and 5,417.20

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Solution

The fourth proportional to 13,740.40, 20,596.20 and 5,417.20 is: 8,120.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,740.40 : 20,596.20 = 5,417.20 : x
  2. Step 2: Convert to fraction form
    13,740.40/20,596.20 = 5,417.20/x
  3. Step 3: Cross multiply
    13,740.40x = 20,596.20 × 5,417.20
  4. Step 4: Simplify right side
    13,740.40x = 111,573,734.64
  5. Step 5: Solve for x
    x = 111,573,734.64/13,740.40
  6. Step 6: Final answer
    x = 8,120.12

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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.