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Finding the Fourth Proportional to 385.59, 531.83 and 245.55

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Solution

The fourth proportional to 385.59, 531.83 and 245.55 is: 338.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.59 : 531.83 = 245.55 : x
  2. Step 2: Convert to fraction form
    385.59/531.83 = 245.55/x
  3. Step 3: Cross multiply
    385.59x = 531.83 × 245.55
  4. Step 4: Simplify right side
    385.59x = 130,589.63
  5. Step 5: Solve for x
    x = 130,589.63/385.59
  6. Step 6: Final answer
    x = 338.67

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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.