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Finding the Fourth Proportional to 921.14, 1,380.80 and 612.24

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Solution

The fourth proportional to 921.14, 1,380.80 and 612.24 is: 917.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.14 : 1,380.80 = 612.24 : x
  2. Step 2: Convert to fraction form
    921.14/1,380.80 = 612.24/x
  3. Step 3: Cross multiply
    921.14x = 1,380.80 × 612.24
  4. Step 4: Simplify right side
    921.14x = 845,380.99
  5. Step 5: Solve for x
    x = 845,380.99/921.14
  6. Step 6: Final answer
    x = 917.76

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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.