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Finding the Fourth Proportional to 138,755.73, 191,482.84 and 78,326.90

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Solution

The fourth proportional to 138,755.73, 191,482.84 and 78,326.90 is: 108,091.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,755.73 : 191,482.84 = 78,326.90 : x
  2. Step 2: Convert to fraction form
    138,755.73/191,482.84 = 78,326.90/x
  3. Step 3: Cross multiply
    138,755.73x = 191,482.84 × 78,326.90
  4. Step 4: Simplify right side
    138,755.73x = 14,998,256,678.36
  5. Step 5: Solve for x
    x = 14,998,256,678.36/138,755.73
  6. Step 6: Final answer
    x = 108,091.08

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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.