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Finding the Fourth Proportional to 289.84, 399.78 and 202.64

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Solution

The fourth proportional to 289.84, 399.78 and 202.64 is: 279.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.84 : 399.78 = 202.64 : x
  2. Step 2: Convert to fraction form
    289.84/399.78 = 202.64/x
  3. Step 3: Cross multiply
    289.84x = 399.78 × 202.64
  4. Step 4: Simplify right side
    289.84x = 81,011.42
  5. Step 5: Solve for x
    x = 81,011.42/289.84
  6. Step 6: Final answer
    x = 279.50

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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.