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Finding the Fourth Proportional to 28,704.60, 42,980.10 and 18,259.80

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Solution

The fourth proportional to 28,704.60, 42,980.10 and 18,259.80 is: 27,340.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,704.60 : 42,980.10 = 18,259.80 : x
  2. Step 2: Convert to fraction form
    28,704.60/42,980.10 = 18,259.80/x
  3. Step 3: Cross multiply
    28,704.60x = 42,980.10 × 18,259.80
  4. Step 4: Simplify right side
    28,704.60x = 784,808,029.98
  5. Step 5: Solve for x
    x = 784,808,029.98/28,704.60
  6. Step 6: Final answer
    x = 27,340.85

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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.