Home / 28,475.13-42,688.39-20,128.89

Finding the Fourth Proportional to 28,475.13, 42,688.39 and 20,128.89

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Solution

The fourth proportional to 28,475.13, 42,688.39 and 20,128.89 is: 30,176.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,475.13 : 42,688.39 = 20,128.89 : x
  2. Step 2: Convert to fraction form
    28,475.13/42,688.39 = 20,128.89/x
  3. Step 3: Cross multiply
    28,475.13x = 42,688.39 × 20,128.89
  4. Step 4: Simplify right side
    28,475.13x = 859,269,906.59
  5. Step 5: Solve for x
    x = 859,269,906.59/28,475.13
  6. Step 6: Final answer
    x = 30,176.15

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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.