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Finding the Fourth Proportional to 138,772.70, 191,510.97 and 85,047.34

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Solution

The fourth proportional to 138,772.70, 191,510.97 and 85,047.34 is: 117,368.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,772.70 : 191,510.97 = 85,047.34 : x
  2. Step 2: Convert to fraction form
    138,772.70/191,510.97 = 85,047.34/x
  3. Step 3: Cross multiply
    138,772.70x = 191,510.97 × 85,047.34
  4. Step 4: Simplify right side
    138,772.70x = 16,287,498,100.54
  5. Step 5: Solve for x
    x = 16,287,498,100.54/138,772.70
  6. Step 6: Final answer
    x = 117,368.17

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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.