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Finding the Fourth Proportional to 18,946.79, 28,440 and 7,860.06

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Solution

The fourth proportional to 18,946.79, 28,440 and 7,860.06 is: 11,798.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,946.79 : 28,440 = 7,860.06 : x
  2. Step 2: Convert to fraction form
    18,946.79/28,440 = 7,860.06/x
  3. Step 3: Cross multiply
    18,946.79x = 28,440 × 7,860.06
  4. Step 4: Simplify right side
    18,946.79x = 223,540,213.05
  5. Step 5: Solve for x
    x = 223,540,213.05/18,946.79
  6. Step 6: Final answer
    x = 11,798.31

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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.