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Finding the Fourth Proportional to 860.72, 1,188.24 and 673.80

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Solution

The fourth proportional to 860.72, 1,188.24 and 673.80 is: 930.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.72 : 1,188.24 = 673.80 : x
  2. Step 2: Convert to fraction form
    860.72/1,188.24 = 673.80/x
  3. Step 3: Cross multiply
    860.72x = 1,188.24 × 673.80
  4. Step 4: Simplify right side
    860.72x = 800,636.11
  5. Step 5: Solve for x
    x = 800,636.11/860.72
  6. Step 6: Final answer
    x = 930.19

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1.5x scale

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.