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Finding the Fourth Proportional to 13,990.88, 20,986.32 and 4,756.88

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Solution

The fourth proportional to 13,990.88, 20,986.32 and 4,756.88 is: 7,135.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.88 : 20,986.32 = 4,756.88 : x
  2. Step 2: Convert to fraction form
    13,990.88/20,986.32 = 4,756.88/x
  3. Step 3: Cross multiply
    13,990.88x = 20,986.32 × 4,756.88
  4. Step 4: Simplify right side
    13,990.88x = 99,829,405.88
  5. Step 5: Solve for x
    x = 99,829,405.88/13,990.88
  6. Step 6: Final answer
    x = 7,135.32

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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.