Home / 15,865.45-21,902.80-10,128.67

Finding the Fourth Proportional to 15,865.45, 21,902.80 and 10,128.67

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Solution

The fourth proportional to 15,865.45, 21,902.80 and 10,128.67 is: 13,982.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,865.45 : 21,902.80 = 10,128.67 : x
  2. Step 2: Convert to fraction form
    15,865.45/21,902.80 = 10,128.67/x
  3. Step 3: Cross multiply
    15,865.45x = 21,902.80 × 10,128.67
  4. Step 4: Simplify right side
    15,865.45x = 221,846,233.28
  5. Step 5: Solve for x
    x = 221,846,233.28/15,865.45
  6. Step 6: Final answer
    x = 13,982.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.