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Finding the Fourth Proportional to 389.46, 536.89 and 278.75

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Solution

The fourth proportional to 389.46, 536.89 and 278.75 is: 384.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.46 : 536.89 = 278.75 : x
  2. Step 2: Convert to fraction form
    389.46/536.89 = 278.75/x
  3. Step 3: Cross multiply
    389.46x = 536.89 × 278.75
  4. Step 4: Simplify right side
    389.46x = 149,657.44
  5. Step 5: Solve for x
    x = 149,657.44/389.46
  6. Step 6: Final answer
    x = 384.27

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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.