Home / 13,990.50-20,985.75-4,129.64

Finding the Fourth Proportional to 13,990.50, 20,985.75 and 4,129.64

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Solution

The fourth proportional to 13,990.50, 20,985.75 and 4,129.64 is: 6,194.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.50 : 20,985.75 = 4,129.64 : x
  2. Step 2: Convert to fraction form
    13,990.50/20,985.75 = 4,129.64/x
  3. Step 3: Cross multiply
    13,990.50x = 20,985.75 × 4,129.64
  4. Step 4: Simplify right side
    13,990.50x = 86,663,566.40
  5. Step 5: Solve for x
    x = 86,663,566.40/13,990.50
  6. Step 6: Final answer
    x = 6,194.46

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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.