Home / 28,005.10-42,007.65-20,131.90

Finding the Fourth Proportional to 28,005.10, 42,007.65 and 20,131.90

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Solution

The fourth proportional to 28,005.10, 42,007.65 and 20,131.90 is: 30,197.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,005.10 : 42,007.65 = 20,131.90 : x
  2. Step 2: Convert to fraction form
    28,005.10/42,007.65 = 20,131.90/x
  3. Step 3: Cross multiply
    28,005.10x = 42,007.65 × 20,131.90
  4. Step 4: Simplify right side
    28,005.10x = 845,693,809.04
  5. Step 5: Solve for x
    x = 845,693,809.04/28,005.10
  6. Step 6: Final answer
    x = 30,197.85

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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.