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Finding the Fourth Proportional to 642,538.68, 886,708.63 and 356,063.55

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Solution

The fourth proportional to 642,538.68, 886,708.63 and 356,063.55 is: 491,370.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,538.68 : 886,708.63 = 356,063.55 : x
  2. Step 2: Convert to fraction form
    642,538.68/886,708.63 = 356,063.55/x
  3. Step 3: Cross multiply
    642,538.68x = 886,708.63 × 356,063.55
  4. Step 4: Simplify right side
    642,538.68x = 315,724,620,833.12
  5. Step 5: Solve for x
    x = 315,724,620,833.12/642,538.68
  6. Step 6: Final answer
    x = 491,370.61

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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.