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Finding the Fourth Proportional to 860.41, 1,187.93 and 660.88

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Solution

The fourth proportional to 860.41, 1,187.93 and 660.88 is: 912.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.41 : 1,187.93 = 660.88 : x
  2. Step 2: Convert to fraction form
    860.41/1,187.93 = 660.88/x
  3. Step 3: Cross multiply
    860.41x = 1,187.93 × 660.88
  4. Step 4: Simplify right side
    860.41x = 785,083.76
  5. Step 5: Solve for x
    x = 785,083.76/860.41
  6. Step 6: Final answer
    x = 912.46

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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.