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Finding the Fourth Proportional to 771.29, 1,157.25 and 309.39

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Solution

The fourth proportional to 771.29, 1,157.25 and 309.39 is: 464.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.29 : 1,157.25 = 309.39 : x
  2. Step 2: Convert to fraction form
    771.29/1,157.25 = 309.39/x
  3. Step 3: Cross multiply
    771.29x = 1,157.25 × 309.39
  4. Step 4: Simplify right side
    771.29x = 358,041.58
  5. Step 5: Solve for x
    x = 358,041.58/771.29
  6. Step 6: Final answer
    x = 464.21

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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.