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Finding the Fourth Proportional to 13,620.40, 18,795.97 and 7,652.18

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Solution

The fourth proportional to 13,620.40, 18,795.97 and 7,652.18 is: 10,559.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620.40 : 18,795.97 = 7,652.18 : x
  2. Step 2: Convert to fraction form
    13,620.40/18,795.97 = 7,652.18/x
  3. Step 3: Cross multiply
    13,620.40x = 18,795.97 × 7,652.18
  4. Step 4: Simplify right side
    13,620.40x = 143,830,145.71
  5. Step 5: Solve for x
    x = 143,830,145.71/13,620.40
  6. Step 6: Final answer
    x = 10,559.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.