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Finding the Fourth Proportional to 19,005.28, 28,468.08 and 12,045.28

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Solution

The fourth proportional to 19,005.28, 28,468.08 and 12,045.28 is: 18,042.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,005.28 : 28,468.08 = 12,045.28 : x
  2. Step 2: Convert to fraction form
    19,005.28/28,468.08 = 12,045.28/x
  3. Step 3: Cross multiply
    19,005.28x = 28,468.08 × 12,045.28
  4. Step 4: Simplify right side
    19,005.28x = 342,905,994.66
  5. Step 5: Solve for x
    x = 342,905,994.66/19,005.28
  6. Step 6: Final answer
    x = 18,042.67

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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.