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Finding the Fourth Proportional to 7,120.52, 10,680.95 and 2,190.20

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Solution

The fourth proportional to 7,120.52, 10,680.95 and 2,190.20 is: 3,285.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.52 : 10,680.95 = 2,190.20 : x
  2. Step 2: Convert to fraction form
    7,120.52/10,680.95 = 2,190.20/x
  3. Step 3: Cross multiply
    7,120.52x = 10,680.95 × 2,190.20
  4. Step 4: Simplify right side
    7,120.52x = 23,393,368.76
  5. Step 5: Solve for x
    x = 23,393,368.76/7,120.52
  6. Step 6: Final answer
    x = 3,285.35

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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.