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Finding the Fourth Proportional to 854.80, 1,280.38 and 529.18

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Solution

The fourth proportional to 854.80, 1,280.38 and 529.18 is: 792.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.80 : 1,280.38 = 529.18 : x
  2. Step 2: Convert to fraction form
    854.80/1,280.38 = 529.18/x
  3. Step 3: Cross multiply
    854.80x = 1,280.38 × 529.18
  4. Step 4: Simplify right side
    854.80x = 677,551.49
  5. Step 5: Solve for x
    x = 677,551.49/854.80
  6. Step 6: Final answer
    x = 792.64

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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.