Home / 20,436.21-28,193.80-12,880.53

Finding the Fourth Proportional to 20,436.21, 28,193.80 and 12,880.53

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Solution

The fourth proportional to 20,436.21, 28,193.80 and 12,880.53 is: 17,769.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,436.21 : 28,193.80 = 12,880.53 : x
  2. Step 2: Convert to fraction form
    20,436.21/28,193.80 = 12,880.53/x
  3. Step 3: Cross multiply
    20,436.21x = 28,193.80 × 12,880.53
  4. Step 4: Simplify right side
    20,436.21x = 363,151,086.71
  5. Step 5: Solve for x
    x = 363,151,086.71/20,436.21
  6. Step 6: Final answer
    x = 17,769.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.