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Finding the Fourth Proportional to 860.93, 1,290.74 and 443.40

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Solution

The fourth proportional to 860.93, 1,290.74 and 443.40 is: 664.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.93 : 1,290.74 = 443.40 : x
  2. Step 2: Convert to fraction form
    860.93/1,290.74 = 443.40/x
  3. Step 3: Cross multiply
    860.93x = 1,290.74 × 443.40
  4. Step 4: Simplify right side
    860.93x = 572,311.90
  5. Step 5: Solve for x
    x = 572,311.90/860.93
  6. Step 6: Final answer
    x = 664.76

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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.