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Finding the Fourth Proportional to 771.46, 1,157.34 and 251.50

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Solution

The fourth proportional to 771.46, 1,157.34 and 251.50 is: 377.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.46 : 1,157.34 = 251.50 : x
  2. Step 2: Convert to fraction form
    771.46/1,157.34 = 251.50/x
  3. Step 3: Cross multiply
    771.46x = 1,157.34 × 251.50
  4. Step 4: Simplify right side
    771.46x = 291,071.01
  5. Step 5: Solve for x
    x = 291,071.01/771.46
  6. Step 6: Final answer
    x = 377.30

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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.