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Finding the Fourth Proportional to 260.72, 359.16 and 202.40

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Solution

The fourth proportional to 260.72, 359.16 and 202.40 is: 278.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.72 : 359.16 = 202.40 : x
  2. Step 2: Convert to fraction form
    260.72/359.16 = 202.40/x
  3. Step 3: Cross multiply
    260.72x = 359.16 × 202.40
  4. Step 4: Simplify right side
    260.72x = 72,693.98
  5. Step 5: Solve for x
    x = 72,693.98/260.72
  6. Step 6: Final answer
    x = 278.82

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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.