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Finding the Fourth Proportional to 377.20, 521.40 and 377.20

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Solution

The fourth proportional to 377.20, 521.40 and 377.20 is: 521.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.20 : 521.40 = 377.20 : x
  2. Step 2: Convert to fraction form
    377.20/521.40 = 377.20/x
  3. Step 3: Cross multiply
    377.20x = 521.40 × 377.20
  4. Step 4: Simplify right side
    377.20x = 196,672.08
  5. Step 5: Solve for x
    x = 196,672.08/377.20
  6. Step 6: Final answer
    x = 521.40

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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.