Home / 21,128-31,692.45-7,986.56

Finding the Fourth Proportional to 21,128, 31,692.45 and 7,986.56

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Solution

The fourth proportional to 21,128, 31,692.45 and 7,986.56 is: 11,980.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128 : 31,692.45 = 7,986.56 : x
  2. Step 2: Convert to fraction form
    21,128/31,692.45 = 7,986.56/x
  3. Step 3: Cross multiply
    21,128x = 31,692.45 × 7,986.56
  4. Step 4: Simplify right side
    21,128x = 253,113,653.47
  5. Step 5: Solve for x
    x = 253,113,653.47/21,128
  6. Step 6: Final answer
    x = 11,980.01

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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.