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Finding the Fourth Proportional to 387.67, 534.95 and 219.63

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Solution

The fourth proportional to 387.67, 534.95 and 219.63 is: 303.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.67 : 534.95 = 219.63 : x
  2. Step 2: Convert to fraction form
    387.67/534.95 = 219.63/x
  3. Step 3: Cross multiply
    387.67x = 534.95 × 219.63
  4. Step 4: Simplify right side
    387.67x = 117,491.07
  5. Step 5: Solve for x
    x = 117,491.07/387.67
  6. Step 6: Final answer
    x = 303.07

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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.