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Finding the Fourth Proportional to 521.71, 782.60 and 156.40

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Solution

The fourth proportional to 521.71, 782.60 and 156.40 is: 234.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.71 : 782.60 = 156.40 : x
  2. Step 2: Convert to fraction form
    521.71/782.60 = 156.40/x
  3. Step 3: Cross multiply
    521.71x = 782.60 × 156.40
  4. Step 4: Simplify right side
    521.71x = 122,395.90
  5. Step 5: Solve for x
    x = 122,395.90/521.71
  6. Step 6: Final answer
    x = 234.61

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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.