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Finding the Fourth Proportional to 28,149.84, 38,811.54 and 20,590.08

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Solution

The fourth proportional to 28,149.84, 38,811.54 and 20,590.08 is: 28,388.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,149.84 : 38,811.54 = 20,590.08 : x
  2. Step 2: Convert to fraction form
    28,149.84/38,811.54 = 20,590.08/x
  3. Step 3: Cross multiply
    28,149.84x = 38,811.54 × 20,590.08
  4. Step 4: Simplify right side
    28,149.84x = 799,132,713.52
  5. Step 5: Solve for x
    x = 799,132,713.52/28,149.84
  6. Step 6: Final answer
    x = 28,388.53

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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.