Home / 20,853.90-28,778.76-11,421.86

Finding the Fourth Proportional to 20,853.90, 28,778.76 and 11,421.86

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Solution

The fourth proportional to 20,853.90, 28,778.76 and 11,421.86 is: 15,762.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,853.90 : 28,778.76 = 11,421.86 : x
  2. Step 2: Convert to fraction form
    20,853.90/28,778.76 = 11,421.86/x
  3. Step 3: Cross multiply
    20,853.90x = 28,778.76 × 11,421.86
  4. Step 4: Simplify right side
    20,853.90x = 328,706,967.69
  5. Step 5: Solve for x
    x = 328,706,967.69/20,853.90
  6. Step 6: Final answer
    x = 15,762.37

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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.