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Finding the Fourth Proportional to 4,321.68, 6,480.48 and 1,981.68

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Solution

The fourth proportional to 4,321.68, 6,480.48 and 1,981.68 is: 2,971.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,321.68 : 6,480.48 = 1,981.68 : x
  2. Step 2: Convert to fraction form
    4,321.68/6,480.48 = 1,981.68/x
  3. Step 3: Cross multiply
    4,321.68x = 6,480.48 × 1,981.68
  4. Step 4: Simplify right side
    4,321.68x = 12,842,237.61
  5. Step 5: Solve for x
    x = 12,842,237.61/4,321.68
  6. Step 6: Final answer
    x = 2,971.58

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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.