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Finding the Fourth Proportional to 30,990.50, 42,879.48 and 27,019.88

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Solution

The fourth proportional to 30,990.50, 42,879.48 and 27,019.88 is: 37,385.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,990.50 : 42,879.48 = 27,019.88 : x
  2. Step 2: Convert to fraction form
    30,990.50/42,879.48 = 27,019.88/x
  3. Step 3: Cross multiply
    30,990.50x = 42,879.48 × 27,019.88
  4. Step 4: Simplify right side
    30,990.50x = 1,158,598,404.06
  5. Step 5: Solve for x
    x = 1,158,598,404.06/30,990.50
  6. Step 6: Final answer
    x = 37,385.60

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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.