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Finding the Fourth Proportional to 777.44, 1,172 and 650

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Solution

The fourth proportional to 777.44, 1,172 and 650 is: 979.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.44 : 1,172 = 650 : x
  2. Step 2: Convert to fraction form
    777.44/1,172 = 650/x
  3. Step 3: Cross multiply
    777.44x = 1,172 × 650
  4. Step 4: Simplify right side
    777.44x = 761,800
  5. Step 5: Solve for x
    x = 761,800/777.44
  6. Step 6: Final answer
    x = 979.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.