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Finding the Fourth Proportional to 138,402.36, 190,955.75 and 77,951.88

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Solution

The fourth proportional to 138,402.36, 190,955.75 and 77,951.88 is: 107,551.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,402.36 : 190,955.75 = 77,951.88 : x
  2. Step 2: Convert to fraction form
    138,402.36/190,955.75 = 77,951.88/x
  3. Step 3: Cross multiply
    138,402.36x = 190,955.75 × 77,951.88
  4. Step 4: Simplify right side
    138,402.36x = 14,885,359,709.31
  5. Step 5: Solve for x
    x = 14,885,359,709.31/138,402.36
  6. Step 6: Final answer
    x = 107,551.34

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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.