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Finding the Fourth Proportional to 859.23, 1,185.68 and 486.29

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Solution

The fourth proportional to 859.23, 1,185.68 and 486.29 is: 671.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.23 : 1,185.68 = 486.29 : x
  2. Step 2: Convert to fraction form
    859.23/1,185.68 = 486.29/x
  3. Step 3: Cross multiply
    859.23x = 1,185.68 × 486.29
  4. Step 4: Simplify right side
    859.23x = 576,579.61
  5. Step 5: Solve for x
    x = 576,579.61/859.23
  6. Step 6: Final answer
    x = 671.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.