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Finding the Fourth Proportional to 855.12, 1,282.98 and 521.94

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Solution

The fourth proportional to 855.12, 1,282.98 and 521.94 is: 783.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.12 : 1,282.98 = 521.94 : x
  2. Step 2: Convert to fraction form
    855.12/1,282.98 = 521.94/x
  3. Step 3: Cross multiply
    855.12x = 1,282.98 × 521.94
  4. Step 4: Simplify right side
    855.12x = 669,638.58
  5. Step 5: Solve for x
    x = 669,638.58/855.12
  6. Step 6: Final answer
    x = 783.09

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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.