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Finding the Fourth Proportional to 664,967.97, 917,678.43 and 393,268.76

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Solution

The fourth proportional to 664,967.97, 917,678.43 and 393,268.76 is: 542,724.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,967.97 : 917,678.43 = 393,268.76 : x
  2. Step 2: Convert to fraction form
    664,967.97/917,678.43 = 393,268.76/x
  3. Step 3: Cross multiply
    664,967.97x = 917,678.43 × 393,268.76
  4. Step 4: Simplify right side
    664,967.97x = 360,894,253,656.46
  5. Step 5: Solve for x
    x = 360,894,253,656.46/664,967.97
  6. Step 6: Final answer
    x = 542,724.27

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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.