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Finding the Fourth Proportional to 554.55, 765.44 and 388.81

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Solution

The fourth proportional to 554.55, 765.44 and 388.81 is: 536.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.55 : 765.44 = 388.81 : x
  2. Step 2: Convert to fraction form
    554.55/765.44 = 388.81/x
  3. Step 3: Cross multiply
    554.55x = 765.44 × 388.81
  4. Step 4: Simplify right side
    554.55x = 297,608.78
  5. Step 5: Solve for x
    x = 297,608.78/554.55
  6. Step 6: Final answer
    x = 536.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.