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Finding the Fourth Proportional to 860.66, 1,290.24 and 552.60

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Solution

The fourth proportional to 860.66, 1,290.24 and 552.60 is: 828.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.66 : 1,290.24 = 552.60 : x
  2. Step 2: Convert to fraction form
    860.66/1,290.24 = 552.60/x
  3. Step 3: Cross multiply
    860.66x = 1,290.24 × 552.60
  4. Step 4: Simplify right side
    860.66x = 712,986.62
  5. Step 5: Solve for x
    x = 712,986.62/860.66
  6. Step 6: Final answer
    x = 828.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.