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Finding the Fourth Proportional to 393,367.45, 542,841.95 and 221,284.97

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Solution

The fourth proportional to 393,367.45, 542,841.95 and 221,284.97 is: 305,370.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,367.45 : 542,841.95 = 221,284.97 : x
  2. Step 2: Convert to fraction form
    393,367.45/542,841.95 = 221,284.97/x
  3. Step 3: Cross multiply
    393,367.45x = 542,841.95 × 221,284.97
  4. Step 4: Simplify right side
    393,367.45x = 120,122,767,978.34
  5. Step 5: Solve for x
    x = 120,122,767,978.34/393,367.45
  6. Step 6: Final answer
    x = 305,370.38

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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.