Home / 21,288.75-31,961.39-18,188.67

Finding the Fourth Proportional to 21,288.75, 31,961.39 and 18,188.67

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Solution

The fourth proportional to 21,288.75, 31,961.39 and 18,188.67 is: 27,307.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,288.75 : 31,961.39 = 18,188.67 : x
  2. Step 2: Convert to fraction form
    21,288.75/31,961.39 = 18,188.67/x
  3. Step 3: Cross multiply
    21,288.75x = 31,961.39 × 18,188.67
  4. Step 4: Simplify right side
    21,288.75x = 581,335,084.51
  5. Step 5: Solve for x
    x = 581,335,084.51/21,288.75
  6. Step 6: Final answer
    x = 27,307.15

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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.