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Finding the Fourth Proportional to 968.50, 1,453.37 and 420.74

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Solution

The fourth proportional to 968.50, 1,453.37 and 420.74 is: 631.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.50 : 1,453.37 = 420.74 : x
  2. Step 2: Convert to fraction form
    968.50/1,453.37 = 420.74/x
  3. Step 3: Cross multiply
    968.50x = 1,453.37 × 420.74
  4. Step 4: Simplify right side
    968.50x = 611,481.52
  5. Step 5: Solve for x
    x = 611,481.52/968.50
  6. Step 6: Final answer
    x = 631.37

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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.