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Finding the Fourth Proportional to 771.81, 1,157.50 and 360.54

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Solution

The fourth proportional to 771.81, 1,157.50 and 360.54 is: 540.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.81 : 1,157.50 = 360.54 : x
  2. Step 2: Convert to fraction form
    771.81/1,157.50 = 360.54/x
  3. Step 3: Cross multiply
    771.81x = 1,157.50 × 360.54
  4. Step 4: Simplify right side
    771.81x = 417,325.50
  5. Step 5: Solve for x
    x = 417,325.50/771.81
  6. Step 6: Final answer
    x = 540.71

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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.