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Finding the Fourth Proportional to 389.68, 579.56 and 385.58

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Solution

The fourth proportional to 389.68, 579.56 and 385.58 is: 573.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.68 : 579.56 = 385.58 : x
  2. Step 2: Convert to fraction form
    389.68/579.56 = 385.58/x
  3. Step 3: Cross multiply
    389.68x = 579.56 × 385.58
  4. Step 4: Simplify right side
    389.68x = 223,466.27
  5. Step 5: Solve for x
    x = 223,466.27/389.68
  6. Step 6: Final answer
    x = 573.46

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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.