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Finding the Fourth Proportional to 771.15, 1,155.93 and 308.31

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Solution

The fourth proportional to 771.15, 1,155.93 and 308.31 is: 462.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.15 : 1,155.93 = 308.31 : x
  2. Step 2: Convert to fraction form
    771.15/1,155.93 = 308.31/x
  3. Step 3: Cross multiply
    771.15x = 1,155.93 × 308.31
  4. Step 4: Simplify right side
    771.15x = 356,384.78
  5. Step 5: Solve for x
    x = 356,384.78/771.15
  6. Step 6: Final answer
    x = 462.15

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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.