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Finding the Fourth Proportional to 258,490.71, 387,736.11 and 80,997.66

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Solution

The fourth proportional to 258,490.71, 387,736.11 and 80,997.66 is: 121,496.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,490.71 : 387,736.11 = 80,997.66 : x
  2. Step 2: Convert to fraction form
    258,490.71/387,736.11 = 80,997.66/x
  3. Step 3: Cross multiply
    258,490.71x = 387,736.11 × 80,997.66
  4. Step 4: Simplify right side
    258,490.71x = 31,405,717,607.50
  5. Step 5: Solve for x
    x = 31,405,717,607.50/258,490.71
  6. Step 6: Final answer
    x = 121,496.50

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.