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Finding the Fourth Proportional to 862.71, 1,190.43 and 489.69

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Solution

The fourth proportional to 862.71, 1,190.43 and 489.69 is: 675.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.71 : 1,190.43 = 489.69 : x
  2. Step 2: Convert to fraction form
    862.71/1,190.43 = 489.69/x
  3. Step 3: Cross multiply
    862.71x = 1,190.43 × 489.69
  4. Step 4: Simplify right side
    862.71x = 582,941.67
  5. Step 5: Solve for x
    x = 582,941.67/862.71
  6. Step 6: Final answer
    x = 675.71

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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.