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Finding the Fourth Proportional to 520.16, 780.36 and 154.94

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Solution

The fourth proportional to 520.16, 780.36 and 154.94 is: 232.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.16 : 780.36 = 154.94 : x
  2. Step 2: Convert to fraction form
    520.16/780.36 = 154.94/x
  3. Step 3: Cross multiply
    520.16x = 780.36 × 154.94
  4. Step 4: Simplify right side
    520.16x = 120,908.98
  5. Step 5: Solve for x
    x = 120,908.98/520.16
  6. Step 6: Final answer
    x = 232.45

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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.