Home / 28,721.39-39,641.20-18,635.67

Finding the Fourth Proportional to 28,721.39, 39,641.20 and 18,635.67

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Solution

The fourth proportional to 28,721.39, 39,641.20 and 18,635.67 is: 25,720.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,721.39 : 39,641.20 = 18,635.67 : x
  2. Step 2: Convert to fraction form
    28,721.39/39,641.20 = 18,635.67/x
  3. Step 3: Cross multiply
    28,721.39x = 39,641.20 × 18,635.67
  4. Step 4: Simplify right side
    28,721.39x = 738,740,275.01
  5. Step 5: Solve for x
    x = 738,740,275.01/28,721.39
  6. Step 6: Final answer
    x = 25,720.91

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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.