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Finding the Fourth Proportional to 13,506.99, 18,639.11 and 7,538.51

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Solution

The fourth proportional to 13,506.99, 18,639.11 and 7,538.51 is: 10,402.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,506.99 : 18,639.11 = 7,538.51 : x
  2. Step 2: Convert to fraction form
    13,506.99/18,639.11 = 7,538.51/x
  3. Step 3: Cross multiply
    13,506.99x = 18,639.11 × 7,538.51
  4. Step 4: Simplify right side
    13,506.99x = 140,510,986.24
  5. Step 5: Solve for x
    x = 140,510,986.24/13,506.99
  6. Step 6: Final answer
    x = 10,402.83

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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.