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Finding the Fourth Proportional to 771.44, 1,156.86 and 309.10

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Solution

The fourth proportional to 771.44, 1,156.86 and 309.10 is: 463.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.44 : 1,156.86 = 309.10 : x
  2. Step 2: Convert to fraction form
    771.44/1,156.86 = 309.10/x
  3. Step 3: Cross multiply
    771.44x = 1,156.86 × 309.10
  4. Step 4: Simplify right side
    771.44x = 357,585.43
  5. Step 5: Solve for x
    x = 357,585.43/771.44
  6. Step 6: Final answer
    x = 463.53

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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.