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Finding the Fourth Proportional to 771.83, 1,157.75 and 258.83

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Solution

The fourth proportional to 771.83, 1,157.75 and 258.83 is: 388.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.83 : 1,157.75 = 258.83 : x
  2. Step 2: Convert to fraction form
    771.83/1,157.75 = 258.83/x
  3. Step 3: Cross multiply
    771.83x = 1,157.75 × 258.83
  4. Step 4: Simplify right side
    771.83x = 299,659.14
  5. Step 5: Solve for x
    x = 299,659.14/771.83
  6. Step 6: Final answer
    x = 388.25

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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.