Home / 28,002.10-42,003.15-20,128.90

Finding the Fourth Proportional to 28,002.10, 42,003.15 and 20,128.90

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Solution

The fourth proportional to 28,002.10, 42,003.15 and 20,128.90 is: 30,193.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,002.10 : 42,003.15 = 20,128.90 : x
  2. Step 2: Convert to fraction form
    28,002.10/42,003.15 = 20,128.90/x
  3. Step 3: Cross multiply
    28,002.10x = 42,003.15 × 20,128.90
  4. Step 4: Simplify right side
    28,002.10x = 845,477,206.04
  5. Step 5: Solve for x
    x = 845,477,206.04/28,002.10
  6. Step 6: Final answer
    x = 30,193.35

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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.