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Finding the Fourth Proportional to 286.86, 430.44 and 266.20

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Solution

The fourth proportional to 286.86, 430.44 and 266.20 is: 399.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.86 : 430.44 = 266.20 : x
  2. Step 2: Convert to fraction form
    286.86/430.44 = 266.20/x
  3. Step 3: Cross multiply
    286.86x = 430.44 × 266.20
  4. Step 4: Simplify right side
    286.86x = 114,583.13
  5. Step 5: Solve for x
    x = 114,583.13/286.86
  6. Step 6: Final answer
    x = 399.44

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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.