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Finding the Fourth Proportional to 13,902.76, 20,868.18 and 12,331.77

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Solution

The fourth proportional to 13,902.76, 20,868.18 and 12,331.77 is: 18,510.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,902.76 : 20,868.18 = 12,331.77 : x
  2. Step 2: Convert to fraction form
    13,902.76/20,868.18 = 12,331.77/x
  3. Step 3: Cross multiply
    13,902.76x = 20,868.18 × 12,331.77
  4. Step 4: Simplify right side
    13,902.76x = 257,341,596.08
  5. Step 5: Solve for x
    x = 257,341,596.08/13,902.76
  6. Step 6: Final answer
    x = 18,510.11

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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.