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Finding the Fourth Proportional to 263.40, 393.74 and 256.92

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Solution

The fourth proportional to 263.40, 393.74 and 256.92 is: 384.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.40 : 393.74 = 256.92 : x
  2. Step 2: Convert to fraction form
    263.40/393.74 = 256.92/x
  3. Step 3: Cross multiply
    263.40x = 393.74 × 256.92
  4. Step 4: Simplify right side
    263.40x = 101,158.40
  5. Step 5: Solve for x
    x = 101,158.40/263.40
  6. Step 6: Final answer
    x = 384.05

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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.