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Finding the Fourth Proportional to 30,879.44, 42,619.08 and 18,311.12

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Solution

The fourth proportional to 30,879.44, 42,619.08 and 18,311.12 is: 25,272.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,879.44 : 42,619.08 = 18,311.12 : x
  2. Step 2: Convert to fraction form
    30,879.44/42,619.08 = 18,311.12/x
  3. Step 3: Cross multiply
    30,879.44x = 42,619.08 × 18,311.12
  4. Step 4: Simplify right side
    30,879.44x = 780,403,088.17
  5. Step 5: Solve for x
    x = 780,403,088.17/30,879.44
  6. Step 6: Final answer
    x = 25,272.58

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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.