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Finding the Fourth Proportional to 18,007.30, 26,978.55 and 15,415.30

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Solution

The fourth proportional to 18,007.30, 26,978.55 and 15,415.30 is: 23,095.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,007.30 : 26,978.55 = 15,415.30 : x
  2. Step 2: Convert to fraction form
    18,007.30/26,978.55 = 15,415.30/x
  3. Step 3: Cross multiply
    18,007.30x = 26,978.55 × 15,415.30
  4. Step 4: Simplify right side
    18,007.30x = 415,882,441.82
  5. Step 5: Solve for x
    x = 415,882,441.82/18,007.30
  6. Step 6: Final answer
    x = 23,095.21

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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.