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Finding the Fourth Proportional to 18,957.19, 28,451.27 and 13,415.87

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Solution

The fourth proportional to 18,957.19, 28,451.27 and 13,415.87 is: 20,134.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,957.19 : 28,451.27 = 13,415.87 : x
  2. Step 2: Convert to fraction form
    18,957.19/28,451.27 = 13,415.87/x
  3. Step 3: Cross multiply
    18,957.19x = 28,451.27 × 13,415.87
  4. Step 4: Simplify right side
    18,957.19x = 381,698,539.65
  5. Step 5: Solve for x
    x = 381,698,539.65/18,957.19
  6. Step 6: Final answer
    x = 20,134.76

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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.