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Finding the Fourth Proportional to 304.60, 420.78 and 261.40

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Solution

The fourth proportional to 304.60, 420.78 and 261.40 is: 361.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.60 : 420.78 = 261.40 : x
  2. Step 2: Convert to fraction form
    304.60/420.78 = 261.40/x
  3. Step 3: Cross multiply
    304.60x = 420.78 × 261.40
  4. Step 4: Simplify right side
    304.60x = 109,991.89
  5. Step 5: Solve for x
    x = 109,991.89/304.60
  6. Step 6: Final answer
    x = 361.10

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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.