Home / 20,419.79-30,615.29-7,929.41

Finding the Fourth Proportional to 20,419.79, 30,615.29 and 7,929.41

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Solution

The fourth proportional to 20,419.79, 30,615.29 and 7,929.41 is: 11,888.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,419.79 : 30,615.29 = 7,929.41 : x
  2. Step 2: Convert to fraction form
    20,419.79/30,615.29 = 7,929.41/x
  3. Step 3: Cross multiply
    20,419.79x = 30,615.29 × 7,929.41
  4. Step 4: Simplify right side
    20,419.79x = 242,761,223.57
  5. Step 5: Solve for x
    x = 242,761,223.57/20,419.79
  6. Step 6: Final answer
    x = 11,888.53

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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.