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Finding the Fourth Proportional to 923.87, 1,385.81 and 307.56

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Solution

The fourth proportional to 923.87, 1,385.81 and 307.56 is: 461.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.87 : 1,385.81 = 307.56 : x
  2. Step 2: Convert to fraction form
    923.87/1,385.81 = 307.56/x
  3. Step 3: Cross multiply
    923.87x = 1,385.81 × 307.56
  4. Step 4: Simplify right side
    923.87x = 426,220.49
  5. Step 5: Solve for x
    x = 426,220.49/923.87
  6. Step 6: Final answer
    x = 461.34

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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.