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Finding the Fourth Proportional to 20,111.70, 30,167.55 and 13,113.30

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Solution

The fourth proportional to 20,111.70, 30,167.55 and 13,113.30 is: 19,669.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,111.70 : 30,167.55 = 13,113.30 : x
  2. Step 2: Convert to fraction form
    20,111.70/30,167.55 = 13,113.30/x
  3. Step 3: Cross multiply
    20,111.70x = 30,167.55 × 13,113.30
  4. Step 4: Simplify right side
    20,111.70x = 395,596,133.42
  5. Step 5: Solve for x
    x = 395,596,133.42/20,111.70
  6. Step 6: Final answer
    x = 19,669.95

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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.