Home / 21,115.84-31,675.20-7,965.76

Finding the Fourth Proportional to 21,115.84, 31,675.20 and 7,965.76

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Solution

The fourth proportional to 21,115.84, 31,675.20 and 7,965.76 is: 11,949.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.84 : 31,675.20 = 7,965.76 : x
  2. Step 2: Convert to fraction form
    21,115.84/31,675.20 = 7,965.76/x
  3. Step 3: Cross multiply
    21,115.84x = 31,675.20 × 7,965.76
  4. Step 4: Simplify right side
    21,115.84x = 252,317,041.15
  5. Step 5: Solve for x
    x = 252,317,041.15/21,115.84
  6. Step 6: Final answer
    x = 11,949.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.