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Finding the Fourth Proportional to 399.60, 595.04 and 389.36

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Solution

The fourth proportional to 399.60, 595.04 and 389.36 is: 579.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.60 : 595.04 = 389.36 : x
  2. Step 2: Convert to fraction form
    399.60/595.04 = 389.36/x
  3. Step 3: Cross multiply
    399.60x = 595.04 × 389.36
  4. Step 4: Simplify right side
    399.60x = 231,684.77
  5. Step 5: Solve for x
    x = 231,684.77/399.60
  6. Step 6: Final answer
    x = 579.79

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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.