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Finding the Fourth Proportional to 262.26, 392.78 and 253.15

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Solution

The fourth proportional to 262.26, 392.78 and 253.15 is: 379.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.26 : 392.78 = 253.15 : x
  2. Step 2: Convert to fraction form
    262.26/392.78 = 253.15/x
  3. Step 3: Cross multiply
    262.26x = 392.78 × 253.15
  4. Step 4: Simplify right side
    262.26x = 99,431.91
  5. Step 5: Solve for x
    x = 99,431.91/262.26
  6. Step 6: Final answer
    x = 379.13

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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.