Home / 20,415.51-28,170.79-11,915.69

Finding the Fourth Proportional to 20,415.51, 28,170.79 and 11,915.69

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Solution

The fourth proportional to 20,415.51, 28,170.79 and 11,915.69 is: 16,442.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,415.51 : 28,170.79 = 11,915.69 : x
  2. Step 2: Convert to fraction form
    20,415.51/28,170.79 = 11,915.69/x
  3. Step 3: Cross multiply
    20,415.51x = 28,170.79 × 11,915.69
  4. Step 4: Simplify right side
    20,415.51x = 335,674,259.84
  5. Step 5: Solve for x
    x = 335,674,259.84/20,415.51
  6. Step 6: Final answer
    x = 16,442.12

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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.