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Finding the Fourth Proportional to 774.90, 1,162.34 and 389.70

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Solution

The fourth proportional to 774.90, 1,162.34 and 389.70 is: 584.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.90 : 1,162.34 = 389.70 : x
  2. Step 2: Convert to fraction form
    774.90/1,162.34 = 389.70/x
  3. Step 3: Cross multiply
    774.90x = 1,162.34 × 389.70
  4. Step 4: Simplify right side
    774.90x = 452,959.06
  5. Step 5: Solve for x
    x = 452,959.06/774.90
  6. Step 6: Final answer
    x = 584.54

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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.