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Finding the Fourth Proportional to 774.93, 1,161.15 and 620.04

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Solution

The fourth proportional to 774.93, 1,161.15 and 620.04 is: 929.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.93 : 1,161.15 = 620.04 : x
  2. Step 2: Convert to fraction form
    774.93/1,161.15 = 620.04/x
  3. Step 3: Cross multiply
    774.93x = 1,161.15 × 620.04
  4. Step 4: Simplify right side
    774.93x = 719,959.45
  5. Step 5: Solve for x
    x = 719,959.45/774.93
  6. Step 6: Final answer
    x = 929.06

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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.