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Finding the Fourth Proportional to 138,777.65, 191,492.40 and 81,395.33

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Solution

The fourth proportional to 138,777.65, 191,492.40 and 81,395.33 is: 112,313.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,777.65 : 191,492.40 = 81,395.33 : x
  2. Step 2: Convert to fraction form
    138,777.65/191,492.40 = 81,395.33/x
  3. Step 3: Cross multiply
    138,777.65x = 191,492.40 × 81,395.33
  4. Step 4: Simplify right side
    138,777.65x = 15,586,587,515.41
  5. Step 5: Solve for x
    x = 15,586,587,515.41/138,777.65
  6. Step 6: Final answer
    x = 112,313.38

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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.