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Finding the Fourth Proportional to 679,761.72, 938,268.36 and 421,717.32

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Solution

The fourth proportional to 679,761.72, 938,268.36 and 421,717.32 is: 582,092.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,761.72 : 938,268.36 = 421,717.32 : x
  2. Step 2: Convert to fraction form
    679,761.72/938,268.36 = 421,717.32/x
  3. Step 3: Cross multiply
    679,761.72x = 938,268.36 × 421,717.32
  4. Step 4: Simplify right side
    679,761.72x = 395,684,018,220.00
  5. Step 5: Solve for x
    x = 395,684,018,220.00/679,761.72
  6. Step 6: Final answer
    x = 582,092.23

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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.