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Finding the Fourth Proportional to 18,937.72, 28,412.88 and 8,406.28

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Solution

The fourth proportional to 18,937.72, 28,412.88 and 8,406.28 is: 12,612.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,937.72 : 28,412.88 = 8,406.28 : x
  2. Step 2: Convert to fraction form
    18,937.72/28,412.88 = 8,406.28/x
  3. Step 3: Cross multiply
    18,937.72x = 28,412.88 × 8,406.28
  4. Step 4: Simplify right side
    18,937.72x = 238,846,624.89
  5. Step 5: Solve for x
    x = 238,846,624.89/18,937.72
  6. Step 6: Final answer
    x = 12,612.22

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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.