Home / 138,120.58-190,605.36-78,504.58

Finding the Fourth Proportional to 138,120.58, 190,605.36 and 78,504.58

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Solution

The fourth proportional to 138,120.58, 190,605.36 and 78,504.58 is: 108,335.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,120.58 : 190,605.36 = 78,504.58 : x
  2. Step 2: Convert to fraction form
    138,120.58/190,605.36 = 78,504.58/x
  3. Step 3: Cross multiply
    138,120.58x = 190,605.36 × 78,504.58
  4. Step 4: Simplify right side
    138,120.58x = 14,963,393,732.55
  5. Step 5: Solve for x
    x = 14,963,393,732.55/138,120.58
  6. Step 6: Final answer
    x = 108,335.73

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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.