Home / 138,128.58-190,616.40-78,512.58

Finding the Fourth Proportional to 138,128.58, 190,616.40 and 78,512.58

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Solution

The fourth proportional to 138,128.58, 190,616.40 and 78,512.58 is: 108,346.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,128.58 : 190,616.40 = 78,512.58 : x
  2. Step 2: Convert to fraction form
    138,128.58/190,616.40 = 78,512.58/x
  3. Step 3: Cross multiply
    138,128.58x = 190,616.40 × 78,512.58
  4. Step 4: Simplify right side
    138,128.58x = 14,965,785,354.31
  5. Step 5: Solve for x
    x = 14,965,785,354.31/138,128.58
  6. Step 6: Final answer
    x = 108,346.77

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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.