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Finding the Fourth Proportional to 520.21, 780.16 and 173.45

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Solution

The fourth proportional to 520.21, 780.16 and 173.45 is: 260.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.21 : 780.16 = 173.45 : x
  2. Step 2: Convert to fraction form
    520.21/780.16 = 173.45/x
  3. Step 3: Cross multiply
    520.21x = 780.16 × 173.45
  4. Step 4: Simplify right side
    520.21x = 135,314.42
  5. Step 5: Solve for x
    x = 135,314.42/520.21
  6. Step 6: Final answer
    x = 260.12

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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.