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Finding the Fourth Proportional to 8,921.87, 12,311.78 and 4,888.68

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Solution

The fourth proportional to 8,921.87, 12,311.78 and 4,888.68 is: 6,746.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,921.87 : 12,311.78 = 4,888.68 : x
  2. Step 2: Convert to fraction form
    8,921.87/12,311.78 = 4,888.68/x
  3. Step 3: Cross multiply
    8,921.87x = 12,311.78 × 4,888.68
  4. Step 4: Simplify right side
    8,921.87x = 60,188,328.21
  5. Step 5: Solve for x
    x = 60,188,328.21/8,921.87
  6. Step 6: Final answer
    x = 6,746.15

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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.