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Finding the Fourth Proportional to 138,653.06, 191,340.78 and 74,990.84

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Solution

The fourth proportional to 138,653.06, 191,340.78 and 74,990.84 is: 103,487.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,653.06 : 191,340.78 = 74,990.84 : x
  2. Step 2: Convert to fraction form
    138,653.06/191,340.78 = 74,990.84/x
  3. Step 3: Cross multiply
    138,653.06x = 191,340.78 × 74,990.84
  4. Step 4: Simplify right side
    138,653.06x = 14,348,805,818.46
  5. Step 5: Solve for x
    x = 14,348,805,818.46/138,653.06
  6. Step 6: Final answer
    x = 103,487.12

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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.