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Finding the Fourth Proportional to 642,812.96, 887,067.72 and 356,330.56

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Solution

The fourth proportional to 642,812.96, 887,067.72 and 356,330.56 is: 491,728.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,812.96 : 887,067.72 = 356,330.56 : x
  2. Step 2: Convert to fraction form
    642,812.96/887,067.72 = 356,330.56/x
  3. Step 3: Cross multiply
    642,812.96x = 887,067.72 × 356,330.56
  4. Step 4: Simplify right side
    642,812.96x = 316,089,337,425.52
  5. Step 5: Solve for x
    x = 316,089,337,425.52/642,812.96
  6. Step 6: Final answer
    x = 491,728.32

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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.