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Finding the Fourth Proportional to 771.41, 1,156.29 and 521.25

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Solution

The fourth proportional to 771.41, 1,156.29 and 521.25 is: 781.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.41 : 1,156.29 = 521.25 : x
  2. Step 2: Convert to fraction form
    771.41/1,156.29 = 521.25/x
  3. Step 3: Cross multiply
    771.41x = 1,156.29 × 521.25
  4. Step 4: Simplify right side
    771.41x = 602,716.16
  5. Step 5: Solve for x
    x = 602,716.16/771.41
  6. Step 6: Final answer
    x = 781.32

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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.