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Finding the Fourth Proportional to 5,679.60, 8,520.48 and 1,980.96

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Solution

The fourth proportional to 5,679.60, 8,520.48 and 1,980.96 is: 2,971.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,679.60 : 8,520.48 = 1,980.96 : x
  2. Step 2: Convert to fraction form
    5,679.60/8,520.48 = 1,980.96/x
  3. Step 3: Cross multiply
    5,679.60x = 8,520.48 × 1,980.96
  4. Step 4: Simplify right side
    5,679.60x = 16,878,730.06
  5. Step 5: Solve for x
    x = 16,878,730.06/5,679.60
  6. Step 6: Final answer
    x = 2,971.82

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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.