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Finding the Fourth Proportional to 387.66, 534.75 and 277.20

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Solution

The fourth proportional to 387.66, 534.75 and 277.20 is: 382.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.66 : 534.75 = 277.20 : x
  2. Step 2: Convert to fraction form
    387.66/534.75 = 277.20/x
  3. Step 3: Cross multiply
    387.66x = 534.75 × 277.20
  4. Step 4: Simplify right side
    387.66x = 148,232.70
  5. Step 5: Solve for x
    x = 148,232.70/387.66
  6. Step 6: Final answer
    x = 382.38

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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.