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Finding the Fourth Proportional to 28,231.56, 38,958.03 and 15,655.50

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Solution

The fourth proportional to 28,231.56, 38,958.03 and 15,655.50 is: 21,603.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,231.56 : 38,958.03 = 15,655.50 : x
  2. Step 2: Convert to fraction form
    28,231.56/38,958.03 = 15,655.50/x
  3. Step 3: Cross multiply
    28,231.56x = 38,958.03 × 15,655.50
  4. Step 4: Simplify right side
    28,231.56x = 609,907,438.67
  5. Step 5: Solve for x
    x = 609,907,438.67/28,231.56
  6. Step 6: Final answer
    x = 21,603.75

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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.