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Finding the Fourth Proportional to 13,415.20, 20,122.80 and 9,959.20

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Solution

The fourth proportional to 13,415.20, 20,122.80 and 9,959.20 is: 14,938.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,415.20 : 20,122.80 = 9,959.20 : x
  2. Step 2: Convert to fraction form
    13,415.20/20,122.80 = 9,959.20/x
  3. Step 3: Cross multiply
    13,415.20x = 20,122.80 × 9,959.20
  4. Step 4: Simplify right side
    13,415.20x = 200,406,989.76
  5. Step 5: Solve for x
    x = 200,406,989.76/13,415.20
  6. Step 6: Final answer
    x = 14,938.80

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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.