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Finding the Fourth Proportional to 13,901.80, 20,852.70 and 12,821.80

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Solution

The fourth proportional to 13,901.80, 20,852.70 and 12,821.80 is: 19,232.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,901.80 : 20,852.70 = 12,821.80 : x
  2. Step 2: Convert to fraction form
    13,901.80/20,852.70 = 12,821.80/x
  3. Step 3: Cross multiply
    13,901.80x = 20,852.70 × 12,821.80
  4. Step 4: Simplify right side
    13,901.80x = 267,369,148.86
  5. Step 5: Solve for x
    x = 267,369,148.86/13,901.80
  6. Step 6: Final answer
    x = 19,232.70

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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.