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Finding the Fourth Proportional to 860.67, 1,291.19 and 283.59

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Solution

The fourth proportional to 860.67, 1,291.19 and 283.59 is: 425.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.67 : 1,291.19 = 283.59 : x
  2. Step 2: Convert to fraction form
    860.67/1,291.19 = 283.59/x
  3. Step 3: Cross multiply
    860.67x = 1,291.19 × 283.59
  4. Step 4: Simplify right side
    860.67x = 366,167.15
  5. Step 5: Solve for x
    x = 366,167.15/860.67
  6. Step 6: Final answer
    x = 425.44

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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.