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Finding the Fourth Proportional to 239,220, 330,138.72 and 131,790.24

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Solution

The fourth proportional to 239,220, 330,138.72 and 131,790.24 is: 181,878.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,220 : 330,138.72 = 131,790.24 : x
  2. Step 2: Convert to fraction form
    239,220/330,138.72 = 131,790.24/x
  3. Step 3: Cross multiply
    239,220x = 330,138.72 × 131,790.24
  4. Step 4: Simplify right side
    239,220x = 43,509,061,142.09
  5. Step 5: Solve for x
    x = 43,509,061,142.09/239,220
  6. Step 6: Final answer
    x = 181,878.86

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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.