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Finding the Fourth Proportional to 774.50, 1,161.78 and 312.50

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Solution

The fourth proportional to 774.50, 1,161.78 and 312.50 is: 468.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.50 : 1,161.78 = 312.50 : x
  2. Step 2: Convert to fraction form
    774.50/1,161.78 = 312.50/x
  3. Step 3: Cross multiply
    774.50x = 1,161.78 × 312.50
  4. Step 4: Simplify right side
    774.50x = 363,056.25
  5. Step 5: Solve for x
    x = 363,056.25/774.50
  6. Step 6: Final answer
    x = 468.76

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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.