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Finding the Fourth Proportional to 13,990.90, 20,989.98 and 5,225.89

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Solution

The fourth proportional to 13,990.90, 20,989.98 and 5,225.89 is: 7,840.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.90 : 20,989.98 = 5,225.89 : x
  2. Step 2: Convert to fraction form
    13,990.90/20,989.98 = 5,225.89/x
  3. Step 3: Cross multiply
    13,990.90x = 20,989.98 × 5,225.89
  4. Step 4: Simplify right side
    13,990.90x = 109,691,326.58
  5. Step 5: Solve for x
    x = 109,691,326.58/13,990.90
  6. Step 6: Final answer
    x = 7,840.19

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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.