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Finding the Fourth Proportional to 5,679.56, 8,520.12 and 1,981.24

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Solution

The fourth proportional to 5,679.56, 8,520.12 and 1,981.24 is: 2,972.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,679.56 : 8,520.12 = 1,981.24 : x
  2. Step 2: Convert to fraction form
    5,679.56/8,520.12 = 1,981.24/x
  3. Step 3: Cross multiply
    5,679.56x = 8,520.12 × 1,981.24
  4. Step 4: Simplify right side
    5,679.56x = 16,880,381.25
  5. Step 5: Solve for x
    x = 16,880,381.25/5,679.56
  6. Step 6: Final answer
    x = 2,972.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.