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Finding the Fourth Proportional to 771.68, 1,157.48 and 309.34

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Solution

The fourth proportional to 771.68, 1,157.48 and 309.34 is: 463.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.68 : 1,157.48 = 309.34 : x
  2. Step 2: Convert to fraction form
    771.68/1,157.48 = 309.34/x
  3. Step 3: Cross multiply
    771.68x = 1,157.48 × 309.34
  4. Step 4: Simplify right side
    771.68x = 358,049.08
  5. Step 5: Solve for x
    x = 358,049.08/771.68
  6. Step 6: Final answer
    x = 463.99

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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.