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Finding the Fourth Proportional to 842.22, 1,162.80 and 645.36

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Solution

The fourth proportional to 842.22, 1,162.80 and 645.36 is: 891.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.22 : 1,162.80 = 645.36 : x
  2. Step 2: Convert to fraction form
    842.22/1,162.80 = 645.36/x
  3. Step 3: Cross multiply
    842.22x = 1,162.80 × 645.36
  4. Step 4: Simplify right side
    842.22x = 750,424.61
  5. Step 5: Solve for x
    x = 750,424.61/842.22
  6. Step 6: Final answer
    x = 891.01

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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.