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Finding the Fourth Proportional to 862.85, 1,190.76 and 489.86

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Solution

The fourth proportional to 862.85, 1,190.76 and 489.86 is: 676.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.85 : 1,190.76 = 489.86 : x
  2. Step 2: Convert to fraction form
    862.85/1,190.76 = 489.86/x
  3. Step 3: Cross multiply
    862.85x = 1,190.76 × 489.86
  4. Step 4: Simplify right side
    862.85x = 583,305.69
  5. Step 5: Solve for x
    x = 583,305.69/862.85
  6. Step 6: Final answer
    x = 676.03

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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.