Home / 20,890.69-31,346.81-13,875.55

Finding the Fourth Proportional to 20,890.69, 31,346.81 and 13,875.55

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Solution

The fourth proportional to 20,890.69, 31,346.81 and 13,875.55 is: 20,820.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.69 : 31,346.81 = 13,875.55 : x
  2. Step 2: Convert to fraction form
    20,890.69/31,346.81 = 13,875.55/x
  3. Step 3: Cross multiply
    20,890.69x = 31,346.81 × 13,875.55
  4. Step 4: Simplify right side
    20,890.69x = 434,954,229.50
  5. Step 5: Solve for x
    x = 434,954,229.50/20,890.69
  6. Step 6: Final answer
    x = 20,820.48

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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.