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Finding the Fourth Proportional to 5,321.48, 7,981.94 and 1,989.47

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Solution

The fourth proportional to 5,321.48, 7,981.94 and 1,989.47 is: 2,984.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,321.48 : 7,981.94 = 1,989.47 : x
  2. Step 2: Convert to fraction form
    5,321.48/7,981.94 = 1,989.47/x
  3. Step 3: Cross multiply
    5,321.48x = 7,981.94 × 1,989.47
  4. Step 4: Simplify right side
    5,321.48x = 15,879,855.10
  5. Step 5: Solve for x
    x = 15,879,855.10/5,321.48
  6. Step 6: Final answer
    x = 2,984.11

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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.