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Finding the Fourth Proportional to 857.77, 1,285.68 and 533.36

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Solution

The fourth proportional to 857.77, 1,285.68 and 533.36 is: 799.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.77 : 1,285.68 = 533.36 : x
  2. Step 2: Convert to fraction form
    857.77/1,285.68 = 533.36/x
  3. Step 3: Cross multiply
    857.77x = 1,285.68 × 533.36
  4. Step 4: Simplify right side
    857.77x = 685,730.28
  5. Step 5: Solve for x
    x = 685,730.28/857.77
  6. Step 6: Final answer
    x = 799.43

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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.