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Finding the Fourth Proportional to 857.03, 1,285.94 and 445.95

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Solution

The fourth proportional to 857.03, 1,285.94 and 445.95 is: 669.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.03 : 1,285.94 = 445.95 : x
  2. Step 2: Convert to fraction form
    857.03/1,285.94 = 445.95/x
  3. Step 3: Cross multiply
    857.03x = 1,285.94 × 445.95
  4. Step 4: Simplify right side
    857.03x = 573,464.94
  5. Step 5: Solve for x
    x = 573,464.94/857.03
  6. Step 6: Final answer
    x = 669.13

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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.