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Finding the Fourth Proportional to 923.78, 1,384.99 and 558.48

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Solution

The fourth proportional to 923.78, 1,384.99 and 558.48 is: 837.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.78 : 1,384.99 = 558.48 : x
  2. Step 2: Convert to fraction form
    923.78/1,384.99 = 558.48/x
  3. Step 3: Cross multiply
    923.78x = 1,384.99 × 558.48
  4. Step 4: Simplify right side
    923.78x = 773,487.82
  5. Step 5: Solve for x
    x = 773,487.82/923.78
  6. Step 6: Final answer
    x = 837.31

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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.