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Finding the Fourth Proportional to 15,919.86, 21,969.35 and 8,750.25

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Solution

The fourth proportional to 15,919.86, 21,969.35 and 8,750.25 is: 12,075.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,919.86 : 21,969.35 = 8,750.25 : x
  2. Step 2: Convert to fraction form
    15,919.86/21,969.35 = 8,750.25/x
  3. Step 3: Cross multiply
    15,919.86x = 21,969.35 × 8,750.25
  4. Step 4: Simplify right side
    15,919.86x = 192,237,261.09
  5. Step 5: Solve for x
    x = 192,237,261.09/15,919.86
  6. Step 6: Final answer
    x = 12,075.31

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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.