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Finding the Fourth Proportional to 969.51, 1,454.10 and 421.54

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Solution

The fourth proportional to 969.51, 1,454.10 and 421.54 is: 632.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.51 : 1,454.10 = 421.54 : x
  2. Step 2: Convert to fraction form
    969.51/1,454.10 = 421.54/x
  3. Step 3: Cross multiply
    969.51x = 1,454.10 × 421.54
  4. Step 4: Simplify right side
    969.51x = 612,961.31
  5. Step 5: Solve for x
    x = 612,961.31/969.51
  6. Step 6: Final answer
    x = 632.24

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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.