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Finding the Fourth Proportional to 18,765.90, 28,152.81 and 7,079.22

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Solution

The fourth proportional to 18,765.90, 28,152.81 and 7,079.22 is: 10,620.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.90 : 28,152.81 = 7,079.22 : x
  2. Step 2: Convert to fraction form
    18,765.90/28,152.81 = 7,079.22/x
  3. Step 3: Cross multiply
    18,765.90x = 28,152.81 × 7,079.22
  4. Step 4: Simplify right side
    18,765.90x = 199,299,935.61
  5. Step 5: Solve for x
    x = 199,299,935.61/18,765.90
  6. Step 6: Final answer
    x = 10,620.32

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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.