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Finding the Fourth Proportional to 715,163.28, 987,010.98 and 428,673.84

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Solution

The fourth proportional to 715,163.28, 987,010.98 and 428,673.84 is: 591,621.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,163.28 : 987,010.98 = 428,673.84 : x
  2. Step 2: Convert to fraction form
    715,163.28/987,010.98 = 428,673.84/x
  3. Step 3: Cross multiply
    715,163.28x = 987,010.98 × 428,673.84
  4. Step 4: Simplify right side
    715,163.28x = 423,105,781,609.95
  5. Step 5: Solve for x
    x = 423,105,781,609.95/715,163.28
  6. Step 6: Final answer
    x = 591,621.24

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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.