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Finding the Fourth Proportional to 138,395.72, 190,987.22 and 78,783.56

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Solution

The fourth proportional to 138,395.72, 190,987.22 and 78,783.56 is: 108,721.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,395.72 : 190,987.22 = 78,783.56 : x
  2. Step 2: Convert to fraction form
    138,395.72/190,987.22 = 78,783.56/x
  3. Step 3: Cross multiply
    138,395.72x = 190,987.22 × 78,783.56
  4. Step 4: Simplify right side
    138,395.72x = 15,046,653,106.10
  5. Step 5: Solve for x
    x = 15,046,653,106.10/138,395.72
  6. Step 6: Final answer
    x = 108,721.95

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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.