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Finding the Fourth Proportional to 389.84, 533.62 and 376.72

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Solution

The fourth proportional to 389.84, 533.62 and 376.72 is: 515.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.84 : 533.62 = 376.72 : x
  2. Step 2: Convert to fraction form
    389.84/533.62 = 376.72/x
  3. Step 3: Cross multiply
    389.84x = 533.62 × 376.72
  4. Step 4: Simplify right side
    389.84x = 201,025.33
  5. Step 5: Solve for x
    x = 201,025.33/389.84
  6. Step 6: Final answer
    x = 515.66

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.