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Finding the Fourth Proportional to 860.94, 1,188.19 and 720.81

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Solution

The fourth proportional to 860.94, 1,188.19 and 720.81 is: 994.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.94 : 1,188.19 = 720.81 : x
  2. Step 2: Convert to fraction form
    860.94/1,188.19 = 720.81/x
  3. Step 3: Cross multiply
    860.94x = 1,188.19 × 720.81
  4. Step 4: Simplify right side
    860.94x = 856,459.23
  5. Step 5: Solve for x
    x = 856,459.23/860.94
  6. Step 6: Final answer
    x = 994.80

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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.