Home / 138,121.08-190,606.05-78,505.08

Finding the Fourth Proportional to 138,121.08, 190,606.05 and 78,505.08

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Solution

The fourth proportional to 138,121.08, 190,606.05 and 78,505.08 is: 108,336.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,121.08 : 190,606.05 = 78,505.08 : x
  2. Step 2: Convert to fraction form
    138,121.08/190,606.05 = 78,505.08/x
  3. Step 3: Cross multiply
    138,121.08x = 190,606.05 × 78,505.08
  4. Step 4: Simplify right side
    138,121.08x = 14,963,543,203.73
  5. Step 5: Solve for x
    x = 14,963,543,203.73/138,121.08
  6. Step 6: Final answer
    x = 108,336.42

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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.