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Finding the Fourth Proportional to 12,495.06, 18,720.72 and 7,290

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Solution

The fourth proportional to 12,495.06, 18,720.72 and 7,290 is: 10,922.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,495.06 : 18,720.72 = 7,290 : x
  2. Step 2: Convert to fraction form
    12,495.06/18,720.72 = 7,290/x
  3. Step 3: Cross multiply
    12,495.06x = 18,720.72 × 7,290
  4. Step 4: Simplify right side
    12,495.06x = 136,474,048.80
  5. Step 5: Solve for x
    x = 136,474,048.80/12,495.06
  6. Step 6: Final answer
    x = 10,922.24

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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.