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Finding the Fourth Proportional to 255.79, 383.70 and 111.46

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Solution

The fourth proportional to 255.79, 383.70 and 111.46 is: 167.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.79 : 383.70 = 111.46 : x
  2. Step 2: Convert to fraction form
    255.79/383.70 = 111.46/x
  3. Step 3: Cross multiply
    255.79x = 383.70 × 111.46
  4. Step 4: Simplify right side
    255.79x = 42,767.20
  5. Step 5: Solve for x
    x = 42,767.20/255.79
  6. Step 6: Final answer
    x = 167.20

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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.