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Finding the Fourth Proportional to 138,653.80, 191,341.54 and 74,991.56

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Solution

The fourth proportional to 138,653.80, 191,341.54 and 74,991.56 is: 103,487.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,653.80 : 191,341.54 = 74,991.56 : x
  2. Step 2: Convert to fraction form
    138,653.80/191,341.54 = 74,991.56/x
  3. Step 3: Cross multiply
    138,653.80x = 191,341.54 × 74,991.56
  4. Step 4: Simplify right side
    138,653.80x = 14,349,000,577.40
  5. Step 5: Solve for x
    x = 14,349,000,577.40/138,653.80
  6. Step 6: Final answer
    x = 103,487.97

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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.