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Finding the Fourth Proportional to 923.86, 1,385.86 and 274.66

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Solution

The fourth proportional to 923.86, 1,385.86 and 274.66 is: 412.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.86 : 1,385.86 = 274.66 : x
  2. Step 2: Convert to fraction form
    923.86/1,385.86 = 274.66/x
  3. Step 3: Cross multiply
    923.86x = 1,385.86 × 274.66
  4. Step 4: Simplify right side
    923.86x = 380,640.31
  5. Step 5: Solve for x
    x = 380,640.31/923.86
  6. Step 6: Final answer
    x = 412.01

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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.