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Finding the Fourth Proportional to 389.36, 580.55 and 384.56

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Solution

The fourth proportional to 389.36, 580.55 and 384.56 is: 573.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.36 : 580.55 = 384.56 : x
  2. Step 2: Convert to fraction form
    389.36/580.55 = 384.56/x
  3. Step 3: Cross multiply
    389.36x = 580.55 × 384.56
  4. Step 4: Simplify right side
    389.36x = 223,251.48
  5. Step 5: Solve for x
    x = 223,251.48/389.36
  6. Step 6: Final answer
    x = 573.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.