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Finding the Fourth Proportional to 20,907.88, 28,858.40 and 12,945.58

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Solution

The fourth proportional to 20,907.88, 28,858.40 and 12,945.58 is: 17,868.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,907.88 : 28,858.40 = 12,945.58 : x
  2. Step 2: Convert to fraction form
    20,907.88/28,858.40 = 12,945.58/x
  3. Step 3: Cross multiply
    20,907.88x = 28,858.40 × 12,945.58
  4. Step 4: Simplify right side
    20,907.88x = 373,588,725.87
  5. Step 5: Solve for x
    x = 373,588,725.87/20,907.88
  6. Step 6: Final answer
    x = 17,868.32

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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.