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Finding the Fourth Proportional to 13,788.01, 20,669.05 and 7,218.51

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Solution

The fourth proportional to 13,788.01, 20,669.05 and 7,218.51 is: 10,820.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,788.01 : 20,669.05 = 7,218.51 : x
  2. Step 2: Convert to fraction form
    13,788.01/20,669.05 = 7,218.51/x
  3. Step 3: Cross multiply
    13,788.01x = 20,669.05 × 7,218.51
  4. Step 4: Simplify right side
    13,788.01x = 149,199,744.12
  5. Step 5: Solve for x
    x = 149,199,744.12/13,788.01
  6. Step 6: Final answer
    x = 10,820.98

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1.5x scale

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.