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Finding the Fourth Proportional to 388.89, 536.70 and 223.15

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Solution

The fourth proportional to 388.89, 536.70 and 223.15 is: 307.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.89 : 536.70 = 223.15 : x
  2. Step 2: Convert to fraction form
    388.89/536.70 = 223.15/x
  3. Step 3: Cross multiply
    388.89x = 536.70 × 223.15
  4. Step 4: Simplify right side
    388.89x = 119,763.26
  5. Step 5: Solve for x
    x = 119,763.26/388.89
  6. Step 6: Final answer
    x = 307.96

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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.