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Finding the Fourth Proportional to 771.61, 1,157.43 and 251.60

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Solution

The fourth proportional to 771.61, 1,157.43 and 251.60 is: 377.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.61 : 1,157.43 = 251.60 : x
  2. Step 2: Convert to fraction form
    771.61/1,157.43 = 251.60/x
  3. Step 3: Cross multiply
    771.61x = 1,157.43 × 251.60
  4. Step 4: Simplify right side
    771.61x = 291,209.39
  5. Step 5: Solve for x
    x = 291,209.39/771.61
  6. Step 6: Final answer
    x = 377.40

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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.