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Finding the Fourth Proportional to 388.87, 536.50 and 220.80

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Solution

The fourth proportional to 388.87, 536.50 and 220.80 is: 304.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.87 : 536.50 = 220.80 : x
  2. Step 2: Convert to fraction form
    388.87/536.50 = 220.80/x
  3. Step 3: Cross multiply
    388.87x = 536.50 × 220.80
  4. Step 4: Simplify right side
    388.87x = 118,459.20
  5. Step 5: Solve for x
    x = 118,459.20/388.87
  6. Step 6: Final answer
    x = 304.62

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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.