Home / 20,890.69-28,830.66-11,459.45

Finding the Fourth Proportional to 20,890.69, 28,830.66 and 11,459.45

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Solution

The fourth proportional to 20,890.69, 28,830.66 and 11,459.45 is: 15,814.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.69 : 28,830.66 = 11,459.45 : x
  2. Step 2: Convert to fraction form
    20,890.69/28,830.66 = 11,459.45/x
  3. Step 3: Cross multiply
    20,890.69x = 28,830.66 × 11,459.45
  4. Step 4: Simplify right side
    20,890.69x = 330,383,506.74
  5. Step 5: Solve for x
    x = 330,383,506.74/20,890.69
  6. Step 6: Final answer
    x = 15,814.87

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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.