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Finding the Fourth Proportional to 378.72, 521.66 and 268.01

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Solution

The fourth proportional to 378.72, 521.66 and 268.01 is: 369.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.72 : 521.66 = 268.01 : x
  2. Step 2: Convert to fraction form
    378.72/521.66 = 268.01/x
  3. Step 3: Cross multiply
    378.72x = 521.66 × 268.01
  4. Step 4: Simplify right side
    378.72x = 139,806.15
  5. Step 5: Solve for x
    x = 139,806.15/378.72
  6. Step 6: Final answer
    x = 369.15

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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.