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Finding the Fourth Proportional to 842.50, 1,162.77 and 805.60

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Solution

The fourth proportional to 842.50, 1,162.77 and 805.60 is: 1,111.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.50 : 1,162.77 = 805.60 : x
  2. Step 2: Convert to fraction form
    842.50/1,162.77 = 805.60/x
  3. Step 3: Cross multiply
    842.50x = 1,162.77 × 805.60
  4. Step 4: Simplify right side
    842.50x = 936,727.51
  5. Step 5: Solve for x
    x = 936,727.51/842.50
  6. Step 6: Final answer
    x = 1,111.84

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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.