Home / 20,939.42-28,897-11,987.84

Finding the Fourth Proportional to 20,939.42, 28,897 and 11,987.84

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Solution

The fourth proportional to 20,939.42, 28,897 and 11,987.84 is: 16,543.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.42 : 28,897 = 11,987.84 : x
  2. Step 2: Convert to fraction form
    20,939.42/28,897 = 11,987.84/x
  3. Step 3: Cross multiply
    20,939.42x = 28,897 × 11,987.84
  4. Step 4: Simplify right side
    20,939.42x = 346,412,612.48
  5. Step 5: Solve for x
    x = 346,412,612.48/20,939.42
  6. Step 6: Final answer
    x = 16,543.56

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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.