Home / 138,009.72-190,200.78-100,218.36

Finding the Fourth Proportional to 138,009.72, 190,200.78 and 100,218.36

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Solution

The fourth proportional to 138,009.72, 190,200.78 and 100,218.36 is: 138,117.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,009.72 : 190,200.78 = 100,218.36 : x
  2. Step 2: Convert to fraction form
    138,009.72/190,200.78 = 100,218.36/x
  3. Step 3: Cross multiply
    138,009.72x = 190,200.78 × 100,218.36
  4. Step 4: Simplify right side
    138,009.72x = 19,061,610,242.32
  5. Step 5: Solve for x
    x = 19,061,610,242.32/138,009.72
  6. Step 6: Final answer
    x = 138,117.88

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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.