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Finding the Fourth Proportional to 771.83, 1,158.20 and 278.39

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Solution

The fourth proportional to 771.83, 1,158.20 and 278.39 is: 417.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.83 : 1,158.20 = 278.39 : x
  2. Step 2: Convert to fraction form
    771.83/1,158.20 = 278.39/x
  3. Step 3: Cross multiply
    771.83x = 1,158.20 × 278.39
  4. Step 4: Simplify right side
    771.83x = 322,427.33
  5. Step 5: Solve for x
    x = 322,427.33/771.83
  6. Step 6: Final answer
    x = 417.74

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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.