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Finding the Fourth Proportional to 20,740.56, 30,978.64 and 18,763.16

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Solution

The fourth proportional to 20,740.56, 30,978.64 and 18,763.16 is: 28,025.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,740.56 : 30,978.64 = 18,763.16 : x
  2. Step 2: Convert to fraction form
    20,740.56/30,978.64 = 18,763.16/x
  3. Step 3: Cross multiply
    20,740.56x = 30,978.64 × 18,763.16
  4. Step 4: Simplify right side
    20,740.56x = 581,257,178.90
  5. Step 5: Solve for x
    x = 581,257,178.90/20,740.56
  6. Step 6: Final answer
    x = 28,025.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.