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Finding the Fourth Proportional to 18,905.68, 28,373.64 and 8,518.24

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Solution

The fourth proportional to 18,905.68, 28,373.64 and 8,518.24 is: 12,784.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.68 : 28,373.64 = 8,518.24 : x
  2. Step 2: Convert to fraction form
    18,905.68/28,373.64 = 8,518.24/x
  3. Step 3: Cross multiply
    18,905.68x = 28,373.64 × 8,518.24
  4. Step 4: Simplify right side
    18,905.68x = 241,693,475.19
  5. Step 5: Solve for x
    x = 241,693,475.19/18,905.68
  6. Step 6: Final answer
    x = 12,784.17

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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.