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Finding the Fourth Proportional to 859.12, 1,185.51 and 486.03

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Solution

The fourth proportional to 859.12, 1,185.51 and 486.03 is: 670.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.12 : 1,185.51 = 486.03 : x
  2. Step 2: Convert to fraction form
    859.12/1,185.51 = 486.03/x
  3. Step 3: Cross multiply
    859.12x = 1,185.51 × 486.03
  4. Step 4: Simplify right side
    859.12x = 576,193.43
  5. Step 5: Solve for x
    x = 576,193.43/859.12
  6. Step 6: Final answer
    x = 670.68

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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.