Home / 21,077.40-31,611.80-7,745.81

Finding the Fourth Proportional to 21,077.40, 31,611.80 and 7,745.81

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Solution

The fourth proportional to 21,077.40, 31,611.80 and 7,745.81 is: 11,617.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,077.40 : 31,611.80 = 7,745.81 : x
  2. Step 2: Convert to fraction form
    21,077.40/31,611.80 = 7,745.81/x
  3. Step 3: Cross multiply
    21,077.40x = 31,611.80 × 7,745.81
  4. Step 4: Simplify right side
    21,077.40x = 244,858,799.77
  5. Step 5: Solve for x
    x = 244,858,799.77/21,077.40
  6. Step 6: Final answer
    x = 11,617.13

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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.