Home / 30,859.20-42,591.60-18,115.20

Finding the Fourth Proportional to 30,859.20, 42,591.60 and 18,115.20

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Solution

The fourth proportional to 30,859.20, 42,591.60 and 18,115.20 is: 25,002.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,859.20 : 42,591.60 = 18,115.20 : x
  2. Step 2: Convert to fraction form
    30,859.20/42,591.60 = 18,115.20/x
  3. Step 3: Cross multiply
    30,859.20x = 42,591.60 × 18,115.20
  4. Step 4: Simplify right side
    30,859.20x = 771,555,352.32
  5. Step 5: Solve for x
    x = 771,555,352.32/30,859.20
  6. Step 6: Final answer
    x = 25,002.44

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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.