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Finding the Fourth Proportional to 5,418.70, 8,128.05 and 2,130

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Solution

The fourth proportional to 5,418.70, 8,128.05 and 2,130 is: 3,195

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418.70 : 8,128.05 = 2,130 : x
  2. Step 2: Convert to fraction form
    5,418.70/8,128.05 = 2,130/x
  3. Step 3: Cross multiply
    5,418.70x = 8,128.05 × 2,130
  4. Step 4: Simplify right side
    5,418.70x = 17,312,746.50
  5. Step 5: Solve for x
    x = 17,312,746.50/5,418.70
  6. Step 6: Final answer
    x = 3,195

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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.