Home / 20,861.40-28,787.58-11,428.08

Finding the Fourth Proportional to 20,861.40, 28,787.58 and 11,428.08

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Solution

The fourth proportional to 20,861.40, 28,787.58 and 11,428.08 is: 15,770.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.40 : 28,787.58 = 11,428.08 : x
  2. Step 2: Convert to fraction form
    20,861.40/28,787.58 = 11,428.08/x
  3. Step 3: Cross multiply
    20,861.40x = 28,787.58 × 11,428.08
  4. Step 4: Simplify right side
    20,861.40x = 328,986,767.25
  5. Step 5: Solve for x
    x = 328,986,767.25/20,861.40
  6. Step 6: Final answer
    x = 15,770.12

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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.