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Finding the Fourth Proportional to 923.45, 1,381.73 and 553.46

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Solution

The fourth proportional to 923.45, 1,381.73 and 553.46 is: 828.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.45 : 1,381.73 = 553.46 : x
  2. Step 2: Convert to fraction form
    923.45/1,381.73 = 553.46/x
  3. Step 3: Cross multiply
    923.45x = 1,381.73 × 553.46
  4. Step 4: Simplify right side
    923.45x = 764,722.61
  5. Step 5: Solve for x
    x = 764,722.61/923.45
  6. Step 6: Final answer
    x = 828.12

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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.