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Finding the Fourth Proportional to 138,791.76, 191,531.04 and 75,128.16

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Solution

The fourth proportional to 138,791.76, 191,531.04 and 75,128.16 is: 103,676.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,791.76 : 191,531.04 = 75,128.16 : x
  2. Step 2: Convert to fraction form
    138,791.76/191,531.04 = 75,128.16/x
  3. Step 3: Cross multiply
    138,791.76x = 191,531.04 × 75,128.16
  4. Step 4: Simplify right side
    138,791.76x = 14,389,374,618.09
  5. Step 5: Solve for x
    x = 14,389,374,618.09/138,791.76
  6. Step 6: Final answer
    x = 103,676.00

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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.