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Finding the Fourth Proportional to 1,150.95, 1,725.39 and 420.03

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Solution

The fourth proportional to 1,150.95, 1,725.39 and 420.03 is: 629.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,150.95 : 1,725.39 = 420.03 : x
  2. Step 2: Convert to fraction form
    1,150.95/1,725.39 = 420.03/x
  3. Step 3: Cross multiply
    1,150.95x = 1,725.39 × 420.03
  4. Step 4: Simplify right side
    1,150.95x = 724,715.56
  5. Step 5: Solve for x
    x = 724,715.56/1,150.95
  6. Step 6: Final answer
    x = 629.67

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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.