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Finding the Fourth Proportional to 923.90, 1,385.42 and 490.94

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Solution

The fourth proportional to 923.90, 1,385.42 and 490.94 is: 736.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.90 : 1,385.42 = 490.94 : x
  2. Step 2: Convert to fraction form
    923.90/1,385.42 = 490.94/x
  3. Step 3: Cross multiply
    923.90x = 1,385.42 × 490.94
  4. Step 4: Simplify right side
    923.90x = 680,158.09
  5. Step 5: Solve for x
    x = 680,158.09/923.90
  6. Step 6: Final answer
    x = 736.18

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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.