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Finding the Fourth Proportional to 521.72, 782.38 and 156.40

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Solution

The fourth proportional to 521.72, 782.38 and 156.40 is: 234.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.72 : 782.38 = 156.40 : x
  2. Step 2: Convert to fraction form
    521.72/782.38 = 156.40/x
  3. Step 3: Cross multiply
    521.72x = 782.38 × 156.40
  4. Step 4: Simplify right side
    521.72x = 122,364.23
  5. Step 5: Solve for x
    x = 122,364.23/521.72
  6. Step 6: Final answer
    x = 234.54

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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.