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Finding the Fourth Proportional to 859.16, 1,185.57 and 486.18

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Solution

The fourth proportional to 859.16, 1,185.57 and 486.18 is: 670.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.16 : 1,185.57 = 486.18 : x
  2. Step 2: Convert to fraction form
    859.16/1,185.57 = 486.18/x
  3. Step 3: Cross multiply
    859.16x = 1,185.57 × 486.18
  4. Step 4: Simplify right side
    859.16x = 576,400.42
  5. Step 5: Solve for x
    x = 576,400.42/859.16
  6. Step 6: Final answer
    x = 670.89

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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.