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Finding the Fourth Proportional to 13,415.40, 20,123.10 and 13,318.20

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Solution

The fourth proportional to 13,415.40, 20,123.10 and 13,318.20 is: 19,977.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,415.40 : 20,123.10 = 13,318.20 : x
  2. Step 2: Convert to fraction form
    13,415.40/20,123.10 = 13,318.20/x
  3. Step 3: Cross multiply
    13,415.40x = 20,123.10 × 13,318.20
  4. Step 4: Simplify right side
    13,415.40x = 268,003,470.42
  5. Step 5: Solve for x
    x = 268,003,470.42/13,415.40
  6. Step 6: Final answer
    x = 19,977.30

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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.