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Finding the Fourth Proportional to 521.71, 782.63 and 156.53

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Solution

The fourth proportional to 521.71, 782.63 and 156.53 is: 234.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.71 : 782.63 = 156.53 : x
  2. Step 2: Convert to fraction form
    521.71/782.63 = 156.53/x
  3. Step 3: Cross multiply
    521.71x = 782.63 × 156.53
  4. Step 4: Simplify right side
    521.71x = 122,505.07
  5. Step 5: Solve for x
    x = 122,505.07/521.71
  6. Step 6: Final answer
    x = 234.81

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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.