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Finding the Fourth Proportional to 969.40, 1,453.90 and 421.60

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Solution

The fourth proportional to 969.40, 1,453.90 and 421.60 is: 632.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.40 : 1,453.90 = 421.60 : x
  2. Step 2: Convert to fraction form
    969.40/1,453.90 = 421.60/x
  3. Step 3: Cross multiply
    969.40x = 1,453.90 × 421.60
  4. Step 4: Simplify right side
    969.40x = 612,964.24
  5. Step 5: Solve for x
    x = 612,964.24/969.40
  6. Step 6: Final answer
    x = 632.31

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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.