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Finding the Fourth Proportional to 923.46, 1,385.08 and 429.56

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Solution

The fourth proportional to 923.46, 1,385.08 and 429.56 is: 644.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.46 : 1,385.08 = 429.56 : x
  2. Step 2: Convert to fraction form
    923.46/1,385.08 = 429.56/x
  3. Step 3: Cross multiply
    923.46x = 1,385.08 × 429.56
  4. Step 4: Simplify right side
    923.46x = 594,974.96
  5. Step 5: Solve for x
    x = 594,974.96/923.46
  6. Step 6: Final answer
    x = 644.29

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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.