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Finding the Fourth Proportional to 393,375.40, 542,852.20 and 221,280.36

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Solution

The fourth proportional to 393,375.40, 542,852.20 and 221,280.36 is: 305,363.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,375.40 : 542,852.20 = 221,280.36 : x
  2. Step 2: Convert to fraction form
    393,375.40/542,852.20 = 221,280.36/x
  3. Step 3: Cross multiply
    393,375.40x = 542,852.20 × 221,280.36
  4. Step 4: Simplify right side
    393,375.40x = 120,122,530,242.79
  5. Step 5: Solve for x
    x = 120,122,530,242.79/393,375.40
  6. Step 6: Final answer
    x = 305,363.60

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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.