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Finding the Fourth Proportional to 266.16, 398.74 and 192.64

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Solution

The fourth proportional to 266.16, 398.74 and 192.64 is: 288.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.16 : 398.74 = 192.64 : x
  2. Step 2: Convert to fraction form
    266.16/398.74 = 192.64/x
  3. Step 3: Cross multiply
    266.16x = 398.74 × 192.64
  4. Step 4: Simplify right side
    266.16x = 76,813.27
  5. Step 5: Solve for x
    x = 76,813.27/266.16
  6. Step 6: Final answer
    x = 288.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.