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Finding the Fourth Proportional to 771.76, 1,157.61 and 309.40

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Solution

The fourth proportional to 771.76, 1,157.61 and 309.40 is: 464.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.76 : 1,157.61 = 309.40 : x
  2. Step 2: Convert to fraction form
    771.76/1,157.61 = 309.40/x
  3. Step 3: Cross multiply
    771.76x = 1,157.61 × 309.40
  4. Step 4: Simplify right side
    771.76x = 358,164.53
  5. Step 5: Solve for x
    x = 358,164.53/771.76
  6. Step 6: Final answer
    x = 464.09

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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.