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Finding the Fourth Proportional to 18,665.64, 28,008 and 12,430.08

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Solution

The fourth proportional to 18,665.64, 28,008 and 12,430.08 is: 18,651.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,665.64 : 28,008 = 12,430.08 : x
  2. Step 2: Convert to fraction form
    18,665.64/28,008 = 12,430.08/x
  3. Step 3: Cross multiply
    18,665.64x = 28,008 × 12,430.08
  4. Step 4: Simplify right side
    18,665.64x = 348,141,680.64
  5. Step 5: Solve for x
    x = 348,141,680.64/18,665.64
  6. Step 6: Final answer
    x = 18,651.47

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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.