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Finding the Fourth Proportional to 239,240, 330,151.20 and 138,696.32

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Solution

The fourth proportional to 239,240, 330,151.20 and 138,696.32 is: 191,400.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,240 : 330,151.20 = 138,696.32 : x
  2. Step 2: Convert to fraction form
    239,240/330,151.20 = 138,696.32/x
  3. Step 3: Cross multiply
    239,240x = 330,151.20 × 138,696.32
  4. Step 4: Simplify right side
    239,240x = 45,790,756,483.58
  5. Step 5: Solve for x
    x = 45,790,756,483.58/239,240
  6. Step 6: Final answer
    x = 191,400.92

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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.