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Finding the Fourth Proportional to 263.51, 393.19 and 261.99

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Solution

The fourth proportional to 263.51, 393.19 and 261.99 is: 390.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.51 : 393.19 = 261.99 : x
  2. Step 2: Convert to fraction form
    263.51/393.19 = 261.99/x
  3. Step 3: Cross multiply
    263.51x = 393.19 × 261.99
  4. Step 4: Simplify right side
    263.51x = 103,011.85
  5. Step 5: Solve for x
    x = 103,011.85/263.51
  6. Step 6: Final answer
    x = 390.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.