Home / 28,138.65-42,210.21-9,418.79

Finding the Fourth Proportional to 28,138.65, 42,210.21 and 9,418.79

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Solution

The fourth proportional to 28,138.65, 42,210.21 and 9,418.79 is: 14,128.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,138.65 : 42,210.21 = 9,418.79 : x
  2. Step 2: Convert to fraction form
    28,138.65/42,210.21 = 9,418.79/x
  3. Step 3: Cross multiply
    28,138.65x = 42,210.21 × 9,418.79
  4. Step 4: Simplify right side
    28,138.65x = 397,568,892.79
  5. Step 5: Solve for x
    x = 397,568,892.79/28,138.65
  6. Step 6: Final answer
    x = 14,128.93

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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.