Home / 21,011.16-31,528.99-7,872.76

Finding the Fourth Proportional to 21,011.16, 31,528.99 and 7,872.76

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Solution

The fourth proportional to 21,011.16, 31,528.99 and 7,872.76 is: 11,813.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.16 : 31,528.99 = 7,872.76 : x
  2. Step 2: Convert to fraction form
    21,011.16/31,528.99 = 7,872.76/x
  3. Step 3: Cross multiply
    21,011.16x = 31,528.99 × 7,872.76
  4. Step 4: Simplify right side
    21,011.16x = 248,220,171.31
  5. Step 5: Solve for x
    x = 248,220,171.31/21,011.16
  6. Step 6: Final answer
    x = 11,813.73

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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.