Home / 20,853.67-28,778.39-11,421.63

Finding the Fourth Proportional to 20,853.67, 28,778.39 and 11,421.63

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Solution

The fourth proportional to 20,853.67, 28,778.39 and 11,421.63 is: 15,762.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,853.67 : 28,778.39 = 11,421.63 : x
  2. Step 2: Convert to fraction form
    20,853.67/28,778.39 = 11,421.63/x
  3. Step 3: Cross multiply
    20,853.67x = 28,778.39 × 11,421.63
  4. Step 4: Simplify right side
    20,853.67x = 328,696,122.58
  5. Step 5: Solve for x
    x = 328,696,122.58/20,853.67
  6. Step 6: Final answer
    x = 15,762.03

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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.