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Finding the Fourth Proportional to 771.20, 1,157.08 and 745.28

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Solution

The fourth proportional to 771.20, 1,157.08 and 745.28 is: 1,118.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.20 : 1,157.08 = 745.28 : x
  2. Step 2: Convert to fraction form
    771.20/1,157.08 = 745.28/x
  3. Step 3: Cross multiply
    771.20x = 1,157.08 × 745.28
  4. Step 4: Simplify right side
    771.20x = 862,348.58
  5. Step 5: Solve for x
    x = 862,348.58/771.20
  6. Step 6: Final answer
    x = 1,118.19

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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.