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Finding the Fourth Proportional to 304.79, 420.45 and 180.40

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Solution

The fourth proportional to 304.79, 420.45 and 180.40 is: 248.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.79 : 420.45 = 180.40 : x
  2. Step 2: Convert to fraction form
    304.79/420.45 = 180.40/x
  3. Step 3: Cross multiply
    304.79x = 420.45 × 180.40
  4. Step 4: Simplify right side
    304.79x = 75,848.13
  5. Step 5: Solve for x
    x = 75,848.13/304.79
  6. Step 6: Final answer
    x = 248.86

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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.