Home / 20,285.91-30,428.87-9,888.75

Finding the Fourth Proportional to 20,285.91, 30,428.87 and 9,888.75

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Solution

The fourth proportional to 20,285.91, 30,428.87 and 9,888.75 is: 14,833.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,285.91 : 30,428.87 = 9,888.75 : x
  2. Step 2: Convert to fraction form
    20,285.91/30,428.87 = 9,888.75/x
  3. Step 3: Cross multiply
    20,285.91x = 30,428.87 × 9,888.75
  4. Step 4: Simplify right side
    20,285.91x = 300,903,438.77
  5. Step 5: Solve for x
    x = 300,903,438.77/20,285.91
  6. Step 6: Final answer
    x = 14,833.13

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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.