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Finding the Fourth Proportional to 15,870.88, 21,900.94 and 8,796.88

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Solution

The fourth proportional to 15,870.88, 21,900.94 and 8,796.88 is: 12,139.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,870.88 : 21,900.94 = 8,796.88 : x
  2. Step 2: Convert to fraction form
    15,870.88/21,900.94 = 8,796.88/x
  3. Step 3: Cross multiply
    15,870.88x = 21,900.94 × 8,796.88
  4. Step 4: Simplify right side
    15,870.88x = 192,659,941.07
  5. Step 5: Solve for x
    x = 192,659,941.07/15,870.88
  6. Step 6: Final answer
    x = 12,139.21

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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.