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Finding the Fourth Proportional to 13,218.95, 18,238.43 and 7,551.65

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Solution

The fourth proportional to 13,218.95, 18,238.43 and 7,551.65 is: 10,419.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,218.95 : 18,238.43 = 7,551.65 : x
  2. Step 2: Convert to fraction form
    13,218.95/18,238.43 = 7,551.65/x
  3. Step 3: Cross multiply
    13,218.95x = 18,238.43 × 7,551.65
  4. Step 4: Simplify right side
    13,218.95x = 137,730,201.79
  5. Step 5: Solve for x
    x = 137,730,201.79/13,218.95
  6. Step 6: Final answer
    x = 10,419.15

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1.5x scale

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.