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Finding the Fourth Proportional to 428,637.26, 642,990.96 and 215,295.48

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Solution

The fourth proportional to 428,637.26, 642,990.96 and 215,295.48 is: 322,960.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,637.26 : 642,990.96 = 215,295.48 : x
  2. Step 2: Convert to fraction form
    428,637.26/642,990.96 = 215,295.48/x
  3. Step 3: Cross multiply
    428,637.26x = 642,990.96 × 215,295.48
  4. Step 4: Simplify right side
    428,637.26x = 138,433,047,368.86
  5. Step 5: Solve for x
    x = 138,433,047,368.86/428,637.26
  6. Step 6: Final answer
    x = 322,960.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.