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Finding the Fourth Proportional to 520.21, 780.12 and 154.88

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Solution

The fourth proportional to 520.21, 780.12 and 154.88 is: 232.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.21 : 780.12 = 154.88 : x
  2. Step 2: Convert to fraction form
    520.21/780.12 = 154.88/x
  3. Step 3: Cross multiply
    520.21x = 780.12 × 154.88
  4. Step 4: Simplify right side
    520.21x = 120,824.99
  5. Step 5: Solve for x
    x = 120,824.99/520.21
  6. Step 6: Final answer
    x = 232.26

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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.