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Finding the Fourth Proportional to 863.06, 1,191.06 and 489.89

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Solution

The fourth proportional to 863.06, 1,191.06 and 489.89 is: 676.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.06 : 1,191.06 = 489.89 : x
  2. Step 2: Convert to fraction form
    863.06/1,191.06 = 489.89/x
  3. Step 3: Cross multiply
    863.06x = 1,191.06 × 489.89
  4. Step 4: Simplify right side
    863.06x = 583,482.43
  5. Step 5: Solve for x
    x = 583,482.43/863.06
  6. Step 6: Final answer
    x = 676.07

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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.