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Finding the Fourth Proportional to 138,866.40, 191,662.20 and 81,518.40

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Solution

The fourth proportional to 138,866.40, 191,662.20 and 81,518.40 is: 112,510.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,866.40 : 191,662.20 = 81,518.40 : x
  2. Step 2: Convert to fraction form
    138,866.40/191,662.20 = 81,518.40/x
  3. Step 3: Cross multiply
    138,866.40x = 191,662.20 × 81,518.40
  4. Step 4: Simplify right side
    138,866.40x = 15,623,995,884.48
  5. Step 5: Solve for x
    x = 15,623,995,884.48/138,866.40
  6. Step 6: Final answer
    x = 112,510.99

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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.