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Finding the Fourth Proportional to 858.90, 1,285.83 and 533.28

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Solution

The fourth proportional to 858.90, 1,285.83 and 533.28 is: 798.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.90 : 1,285.83 = 533.28 : x
  2. Step 2: Convert to fraction form
    858.90/1,285.83 = 533.28/x
  3. Step 3: Cross multiply
    858.90x = 1,285.83 × 533.28
  4. Step 4: Simplify right side
    858.90x = 685,707.42
  5. Step 5: Solve for x
    x = 685,707.42/858.90
  6. Step 6: Final answer
    x = 798.36

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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.