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Finding the Fourth Proportional to 860.95, 1,186 and 685.99

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Solution

The fourth proportional to 860.95, 1,186 and 685.99 is: 944.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.95 : 1,186 = 685.99 : x
  2. Step 2: Convert to fraction form
    860.95/1,186 = 685.99/x
  3. Step 3: Cross multiply
    860.95x = 1,186 × 685.99
  4. Step 4: Simplify right side
    860.95x = 813,584.14
  5. Step 5: Solve for x
    x = 813,584.14/860.95
  6. Step 6: Final answer
    x = 944.98

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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.