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Finding the Fourth Proportional to 399.36, 601.76 and 389.60

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Solution

The fourth proportional to 399.36, 601.76 and 389.60 is: 587.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.36 : 601.76 = 389.60 : x
  2. Step 2: Convert to fraction form
    399.36/601.76 = 389.60/x
  3. Step 3: Cross multiply
    399.36x = 601.76 × 389.60
  4. Step 4: Simplify right side
    399.36x = 234,445.70
  5. Step 5: Solve for x
    x = 234,445.70/399.36
  6. Step 6: Final answer
    x = 587.05

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.