Home / 20,915.25-28,887.65-14,189.21

Finding the Fourth Proportional to 20,915.25, 28,887.65 and 14,189.21

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Solution

The fourth proportional to 20,915.25, 28,887.65 and 14,189.21 is: 19,597.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.25 : 28,887.65 = 14,189.21 : x
  2. Step 2: Convert to fraction form
    20,915.25/28,887.65 = 14,189.21/x
  3. Step 3: Cross multiply
    20,915.25x = 28,887.65 × 14,189.21
  4. Step 4: Simplify right side
    20,915.25x = 409,892,716.87
  5. Step 5: Solve for x
    x = 409,892,716.87/20,915.25
  6. Step 6: Final answer
    x = 19,597.79

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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.