Home / 28,455.69-42,648.98-20,138.15

Finding the Fourth Proportional to 28,455.69, 42,648.98 and 20,138.15

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Solution

The fourth proportional to 28,455.69, 42,648.98 and 20,138.15 is: 30,182.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,455.69 : 42,648.98 = 20,138.15 : x
  2. Step 2: Convert to fraction form
    28,455.69/42,648.98 = 20,138.15/x
  3. Step 3: Cross multiply
    28,455.69x = 42,648.98 × 20,138.15
  4. Step 4: Simplify right side
    28,455.69x = 858,871,242.65
  5. Step 5: Solve for x
    x = 858,871,242.65/28,455.69
  6. Step 6: Final answer
    x = 30,182.76

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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.