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Finding the Fourth Proportional to 12,489.74, 18,735.21 and 4,697.95

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Solution

The fourth proportional to 12,489.74, 18,735.21 and 4,697.95 is: 7,047.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.74 : 18,735.21 = 4,697.95 : x
  2. Step 2: Convert to fraction form
    12,489.74/18,735.21 = 4,697.95/x
  3. Step 3: Cross multiply
    12,489.74x = 18,735.21 × 4,697.95
  4. Step 4: Simplify right side
    12,489.74x = 88,017,079.82
  5. Step 5: Solve for x
    x = 88,017,079.82/12,489.74
  6. Step 6: Final answer
    x = 7,047.15

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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.