Home / 15,511.88-21,396.79-13,527.20

Finding the Fourth Proportional to 15,511.88, 21,396.79 and 13,527.20

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Solution

The fourth proportional to 15,511.88, 21,396.79 and 13,527.20 is: 18,659.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.88 : 21,396.79 = 13,527.20 : x
  2. Step 2: Convert to fraction form
    15,511.88/21,396.79 = 13,527.20/x
  3. Step 3: Cross multiply
    15,511.88x = 21,396.79 × 13,527.20
  4. Step 4: Simplify right side
    15,511.88x = 289,438,657.69
  5. Step 5: Solve for x
    x = 289,438,657.69/15,511.88
  6. Step 6: Final answer
    x = 18,659.16

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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.