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Finding the Fourth Proportional to 393,216.98, 542,634.26 and 221,134.91

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Solution

The fourth proportional to 393,216.98, 542,634.26 and 221,134.91 is: 305,163.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,216.98 : 542,634.26 = 221,134.91 : x
  2. Step 2: Convert to fraction form
    393,216.98/542,634.26 = 221,134.91/x
  3. Step 3: Cross multiply
    393,216.98x = 542,634.26 × 221,134.91
  4. Step 4: Simplify right side
    393,216.98x = 119,995,374,429.17
  5. Step 5: Solve for x
    x = 119,995,374,429.17/393,216.98
  6. Step 6: Final answer
    x = 305,163.26

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1.5x scale

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.