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Finding the Fourth Proportional to 520.15, 780.38 and 154.95

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Solution

The fourth proportional to 520.15, 780.38 and 154.95 is: 232.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.15 : 780.38 = 154.95 : x
  2. Step 2: Convert to fraction form
    520.15/780.38 = 154.95/x
  3. Step 3: Cross multiply
    520.15x = 780.38 × 154.95
  4. Step 4: Simplify right side
    520.15x = 120,919.88
  5. Step 5: Solve for x
    x = 120,919.88/520.15
  6. Step 6: Final answer
    x = 232.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.