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Finding the Fourth Proportional to 845.36, 1,166.86 and 687.86

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Solution

The fourth proportional to 845.36, 1,166.86 and 687.86 is: 949.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.36 : 1,166.86 = 687.86 : x
  2. Step 2: Convert to fraction form
    845.36/1,166.86 = 687.86/x
  3. Step 3: Cross multiply
    845.36x = 1,166.86 × 687.86
  4. Step 4: Simplify right side
    845.36x = 802,636.32
  5. Step 5: Solve for x
    x = 802,636.32/845.36
  6. Step 6: Final answer
    x = 949.46

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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.