Home / 138,120.47-190,608.21-81,531.84

Finding the Fourth Proportional to 138,120.47, 190,608.21 and 81,531.84

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Solution

The fourth proportional to 138,120.47, 190,608.21 and 81,531.84 is: 112,515.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,120.47 : 190,608.21 = 81,531.84 : x
  2. Step 2: Convert to fraction form
    138,120.47/190,608.21 = 81,531.84/x
  3. Step 3: Cross multiply
    138,120.47x = 190,608.21 × 81,531.84
  4. Step 4: Simplify right side
    138,120.47x = 15,540,638,080.41
  5. Step 5: Solve for x
    x = 15,540,638,080.41/138,120.47
  6. Step 6: Final answer
    x = 112,515.10

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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.