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Finding the Fourth Proportional to 859.46, 1,185.97 and 486.45

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Solution

The fourth proportional to 859.46, 1,185.97 and 486.45 is: 671.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.46 : 1,185.97 = 486.45 : x
  2. Step 2: Convert to fraction form
    859.46/1,185.97 = 486.45/x
  3. Step 3: Cross multiply
    859.46x = 1,185.97 × 486.45
  4. Step 4: Simplify right side
    859.46x = 576,915.11
  5. Step 5: Solve for x
    x = 576,915.11/859.46
  6. Step 6: Final answer
    x = 671.25

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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.