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Finding the Fourth Proportional to 389.02, 536.46 and 257.80

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Solution

The fourth proportional to 389.02, 536.46 and 257.80 is: 355.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.02 : 536.46 = 257.80 : x
  2. Step 2: Convert to fraction form
    389.02/536.46 = 257.80/x
  3. Step 3: Cross multiply
    389.02x = 536.46 × 257.80
  4. Step 4: Simplify right side
    389.02x = 138,299.39
  5. Step 5: Solve for x
    x = 138,299.39/389.02
  6. Step 6: Final answer
    x = 355.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.