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Finding the Fourth Proportional to 854.55, 1,280.61 and 443.07

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Solution

The fourth proportional to 854.55, 1,280.61 and 443.07 is: 663.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.55 : 1,280.61 = 443.07 : x
  2. Step 2: Convert to fraction form
    854.55/1,280.61 = 443.07/x
  3. Step 3: Cross multiply
    854.55x = 1,280.61 × 443.07
  4. Step 4: Simplify right side
    854.55x = 567,399.87
  5. Step 5: Solve for x
    x = 567,399.87/854.55
  6. Step 6: Final answer
    x = 663.98

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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.