Home / 20,518.65-28,315.74-11,087.21

Finding the Fourth Proportional to 20,518.65, 28,315.74 and 11,087.21

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Solution

The fourth proportional to 20,518.65, 28,315.74 and 11,087.21 is: 15,300.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,518.65 : 28,315.74 = 11,087.21 : x
  2. Step 2: Convert to fraction form
    20,518.65/28,315.74 = 11,087.21/x
  3. Step 3: Cross multiply
    20,518.65x = 28,315.74 × 11,087.21
  4. Step 4: Simplify right side
    20,518.65x = 313,942,555.69
  5. Step 5: Solve for x
    x = 313,942,555.69/20,518.65
  6. Step 6: Final answer
    x = 15,300.35

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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.