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Finding the Fourth Proportional to 18,720.48, 28,063.36 and 7,041.44

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Solution

The fourth proportional to 18,720.48, 28,063.36 and 7,041.44 is: 10,555.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.48 : 28,063.36 = 7,041.44 : x
  2. Step 2: Convert to fraction form
    18,720.48/28,063.36 = 7,041.44/x
  3. Step 3: Cross multiply
    18,720.48x = 28,063.36 × 7,041.44
  4. Step 4: Simplify right side
    18,720.48x = 197,606,465.64
  5. Step 5: Solve for x
    x = 197,606,465.64/18,720.48
  6. Step 6: Final answer
    x = 10,555.63

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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.