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Finding the Fourth Proportional to 642,538.55, 886,708.45 and 356,063.42

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Solution

The fourth proportional to 642,538.55, 886,708.45 and 356,063.42 is: 491,370.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,538.55 : 886,708.45 = 356,063.42 : x
  2. Step 2: Convert to fraction form
    642,538.55/886,708.45 = 356,063.42/x
  3. Step 3: Cross multiply
    642,538.55x = 886,708.45 × 356,063.42
  4. Step 4: Simplify right side
    642,538.55x = 315,724,445,911.75
  5. Step 5: Solve for x
    x = 315,724,445,911.75/642,538.55
  6. Step 6: Final answer
    x = 491,370.43

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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.