Home / 20,419.98-30,615.57-7,929.60

Finding the Fourth Proportional to 20,419.98, 30,615.57 and 7,929.60

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Solution

The fourth proportional to 20,419.98, 30,615.57 and 7,929.60 is: 11,888.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,419.98 : 30,615.57 = 7,929.60 : x
  2. Step 2: Convert to fraction form
    20,419.98/30,615.57 = 7,929.60/x
  3. Step 3: Cross multiply
    20,419.98x = 30,615.57 × 7,929.60
  4. Step 4: Simplify right side
    20,419.98x = 242,769,223.87
  5. Step 5: Solve for x
    x = 242,769,223.87/20,419.98
  6. Step 6: Final answer
    x = 11,888.81

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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.