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Finding the Fourth Proportional to 13,986.90, 20,980.35 and 8,457.30

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Solution

The fourth proportional to 13,986.90, 20,980.35 and 8,457.30 is: 12,685.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,986.90 : 20,980.35 = 8,457.30 : x
  2. Step 2: Convert to fraction form
    13,986.90/20,980.35 = 8,457.30/x
  3. Step 3: Cross multiply
    13,986.90x = 20,980.35 × 8,457.30
  4. Step 4: Simplify right side
    13,986.90x = 177,437,114.06
  5. Step 5: Solve for x
    x = 177,437,114.06/13,986.90
  6. Step 6: Final answer
    x = 12,685.95

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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.