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Finding the Fourth Proportional to 860.16, 1,185.60 and 663.60

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Solution

The fourth proportional to 860.16, 1,185.60 and 663.60 is: 914.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.16 : 1,185.60 = 663.60 : x
  2. Step 2: Convert to fraction form
    860.16/1,185.60 = 663.60/x
  3. Step 3: Cross multiply
    860.16x = 1,185.60 × 663.60
  4. Step 4: Simplify right side
    860.16x = 786,764.16
  5. Step 5: Solve for x
    x = 786,764.16/860.16
  6. Step 6: Final answer
    x = 914.67

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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.