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Finding the Fourth Proportional to 678,540.70, 936,319.89 and 392,054.64

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Solution

The fourth proportional to 678,540.70, 936,319.89 and 392,054.64 is: 540,997.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,540.70 : 936,319.89 = 392,054.64 : x
  2. Step 2: Convert to fraction form
    678,540.70/936,319.89 = 392,054.64/x
  3. Step 3: Cross multiply
    678,540.70x = 936,319.89 × 392,054.64
  4. Step 4: Simplify right side
    678,540.70x = 367,088,557,398.79
  5. Step 5: Solve for x
    x = 367,088,557,398.79/678,540.70
  6. Step 6: Final answer
    x = 540,997.11

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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.