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Finding the Fourth Proportional to 859.29, 1,185.95 and 486.42

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Solution

The fourth proportional to 859.29, 1,185.95 and 486.42 is: 671.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.29 : 1,185.95 = 486.42 : x
  2. Step 2: Convert to fraction form
    859.29/1,185.95 = 486.42/x
  3. Step 3: Cross multiply
    859.29x = 1,185.95 × 486.42
  4. Step 4: Simplify right side
    859.29x = 576,869.80
  5. Step 5: Solve for x
    x = 576,869.80/859.29
  6. Step 6: Final answer
    x = 671.33

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Double scale
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1.5x scale

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.