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Finding the Fourth Proportional to 13,009.12, 19,518 and 8,643.76

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Solution

The fourth proportional to 13,009.12, 19,518 and 8,643.76 is: 12,968.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,009.12 : 19,518 = 8,643.76 : x
  2. Step 2: Convert to fraction form
    13,009.12/19,518 = 8,643.76/x
  3. Step 3: Cross multiply
    13,009.12x = 19,518 × 8,643.76
  4. Step 4: Simplify right side
    13,009.12x = 168,708,907.68
  5. Step 5: Solve for x
    x = 168,708,907.68/13,009.12
  6. Step 6: Final answer
    x = 12,968.51

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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.