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Finding the Fourth Proportional to 842.10, 1,162.20 and 492.80

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Solution

The fourth proportional to 842.10, 1,162.20 and 492.80 is: 680.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.10 : 1,162.20 = 492.80 : x
  2. Step 2: Convert to fraction form
    842.10/1,162.20 = 492.80/x
  3. Step 3: Cross multiply
    842.10x = 1,162.20 × 492.80
  4. Step 4: Simplify right side
    842.10x = 572,732.16
  5. Step 5: Solve for x
    x = 572,732.16/842.10
  6. Step 6: Final answer
    x = 680.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.