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Finding the Fourth Proportional to 857.23, 1,285.54 and 309.33

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Solution

The fourth proportional to 857.23, 1,285.54 and 309.33 is: 463.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.23 : 1,285.54 = 309.33 : x
  2. Step 2: Convert to fraction form
    857.23/1,285.54 = 309.33/x
  3. Step 3: Cross multiply
    857.23x = 1,285.54 × 309.33
  4. Step 4: Simplify right side
    857.23x = 397,655.31
  5. Step 5: Solve for x
    x = 397,655.31/857.23
  6. Step 6: Final answer
    x = 463.89

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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.