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Finding the Fourth Proportional to 923.78, 1,385.88 and 307.56

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Solution

The fourth proportional to 923.78, 1,385.88 and 307.56 is: 461.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.78 : 1,385.88 = 307.56 : x
  2. Step 2: Convert to fraction form
    923.78/1,385.88 = 307.56/x
  3. Step 3: Cross multiply
    923.78x = 1,385.88 × 307.56
  4. Step 4: Simplify right side
    923.78x = 426,241.25
  5. Step 5: Solve for x
    x = 426,241.25/923.78
  6. Step 6: Final answer
    x = 461.41

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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.