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Finding the Fourth Proportional to 520.07, 780.20 and 154.85

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Solution

The fourth proportional to 520.07, 780.20 and 154.85 is: 232.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.07 : 780.20 = 154.85 : x
  2. Step 2: Convert to fraction form
    520.07/780.20 = 154.85/x
  3. Step 3: Cross multiply
    520.07x = 780.20 × 154.85
  4. Step 4: Simplify right side
    520.07x = 120,809.29
  5. Step 5: Solve for x
    x = 120,809.29/520.07
  6. Step 6: Final answer
    x = 232.30

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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.