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Finding the Fourth Proportional to 520.44, 780.68 and 135.68

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Solution

The fourth proportional to 520.44, 780.68 and 135.68 is: 203.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.44 : 780.68 = 135.68 : x
  2. Step 2: Convert to fraction form
    520.44/780.68 = 135.68/x
  3. Step 3: Cross multiply
    520.44x = 780.68 × 135.68
  4. Step 4: Simplify right side
    520.44x = 105,922.66
  5. Step 5: Solve for x
    x = 105,922.66/520.44
  6. Step 6: Final answer
    x = 203.53

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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.