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Finding the Fourth Proportional to 388.42, 536.15 and 277.85

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Solution

The fourth proportional to 388.42, 536.15 and 277.85 is: 383.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.42 : 536.15 = 277.85 : x
  2. Step 2: Convert to fraction form
    388.42/536.15 = 277.85/x
  3. Step 3: Cross multiply
    388.42x = 536.15 × 277.85
  4. Step 4: Simplify right side
    388.42x = 148,969.28
  5. Step 5: Solve for x
    x = 148,969.28/388.42
  6. Step 6: Final answer
    x = 383.53

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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.