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Finding the Fourth Proportional to 13,976.20, 20,988.60 and 7,415.20

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Solution

The fourth proportional to 13,976.20, 20,988.60 and 7,415.20 is: 11,135.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,976.20 : 20,988.60 = 7,415.20 : x
  2. Step 2: Convert to fraction form
    13,976.20/20,988.60 = 7,415.20/x
  3. Step 3: Cross multiply
    13,976.20x = 20,988.60 × 7,415.20
  4. Step 4: Simplify right side
    13,976.20x = 155,634,666.72
  5. Step 5: Solve for x
    x = 155,634,666.72/13,976.20
  6. Step 6: Final answer
    x = 11,135.69

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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.