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Finding the Fourth Proportional to 772.51, 1,158.81 and 279.03

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Solution

The fourth proportional to 772.51, 1,158.81 and 279.03 is: 418.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.51 : 1,158.81 = 279.03 : x
  2. Step 2: Convert to fraction form
    772.51/1,158.81 = 279.03/x
  3. Step 3: Cross multiply
    772.51x = 1,158.81 × 279.03
  4. Step 4: Simplify right side
    772.51x = 323,342.75
  5. Step 5: Solve for x
    x = 323,342.75/772.51
  6. Step 6: Final answer
    x = 418.56

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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.