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Finding the Fourth Proportional to 842.10, 1,261.95 and 328.50

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Solution

The fourth proportional to 842.10, 1,261.95 and 328.50 is: 492.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.10 : 1,261.95 = 328.50 : x
  2. Step 2: Convert to fraction form
    842.10/1,261.95 = 328.50/x
  3. Step 3: Cross multiply
    842.10x = 1,261.95 × 328.50
  4. Step 4: Simplify right side
    842.10x = 414,550.58
  5. Step 5: Solve for x
    x = 414,550.58/842.10
  6. Step 6: Final answer
    x = 492.28

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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.