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Finding the Fourth Proportional to 923.17, 1,384.28 and 817.90

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Solution

The fourth proportional to 923.17, 1,384.28 and 817.90 is: 1,226.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.17 : 1,384.28 = 817.90 : x
  2. Step 2: Convert to fraction form
    923.17/1,384.28 = 817.90/x
  3. Step 3: Cross multiply
    923.17x = 1,384.28 × 817.90
  4. Step 4: Simplify right side
    923.17x = 1,132,208.97
  5. Step 5: Solve for x
    x = 1,132,208.97/923.17
  6. Step 6: Final answer
    x = 1,226.43

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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.