Home / 30,581.64-42,163.20-20,511.72

Finding the Fourth Proportional to 30,581.64, 42,163.20 and 20,511.72

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Solution

The fourth proportional to 30,581.64, 42,163.20 and 20,511.72 is: 28,279.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,581.64 : 42,163.20 = 20,511.72 : x
  2. Step 2: Convert to fraction form
    30,581.64/42,163.20 = 20,511.72/x
  3. Step 3: Cross multiply
    30,581.64x = 42,163.20 × 20,511.72
  4. Step 4: Simplify right side
    30,581.64x = 864,839,752.70
  5. Step 5: Solve for x
    x = 864,839,752.70/30,581.64
  6. Step 6: Final answer
    x = 28,279.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.