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Finding the Fourth Proportional to 18,987.92, 28,507.80 and 12,093.20

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Solution

The fourth proportional to 18,987.92, 28,507.80 and 12,093.20 is: 18,156.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.92 : 28,507.80 = 12,093.20 : x
  2. Step 2: Convert to fraction form
    18,987.92/28,507.80 = 12,093.20/x
  3. Step 3: Cross multiply
    18,987.92x = 28,507.80 × 12,093.20
  4. Step 4: Simplify right side
    18,987.92x = 344,750,526.96
  5. Step 5: Solve for x
    x = 344,750,526.96/18,987.92
  6. Step 6: Final answer
    x = 18,156.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.