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Finding the Fourth Proportional to 1,449.50, 2,174.70 and 423.50

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Solution

The fourth proportional to 1,449.50, 2,174.70 and 423.50 is: 635.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.50 : 2,174.70 = 423.50 : x
  2. Step 2: Convert to fraction form
    1,449.50/2,174.70 = 423.50/x
  3. Step 3: Cross multiply
    1,449.50x = 2,174.70 × 423.50
  4. Step 4: Simplify right side
    1,449.50x = 920,985.45
  5. Step 5: Solve for x
    x = 920,985.45/1,449.50
  6. Step 6: Final answer
    x = 635.38

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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.