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Finding the Fourth Proportional to 239,172, 330,057.36 and 138,628.32

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Solution

The fourth proportional to 239,172, 330,057.36 and 138,628.32 is: 191,307.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,172 : 330,057.36 = 138,628.32 : x
  2. Step 2: Convert to fraction form
    239,172/330,057.36 = 138,628.32/x
  3. Step 3: Cross multiply
    239,172x = 330,057.36 × 138,628.32
  4. Step 4: Simplify right side
    239,172x = 45,755,297,320.44
  5. Step 5: Solve for x
    x = 45,755,297,320.44/239,172
  6. Step 6: Final answer
    x = 191,307.08

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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.