Home / 19,611.45-29,409.80-7,128.39

Finding the Fourth Proportional to 19,611.45, 29,409.80 and 7,128.39

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Solution

The fourth proportional to 19,611.45, 29,409.80 and 7,128.39 is: 10,689.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,611.45 : 29,409.80 = 7,128.39 : x
  2. Step 2: Convert to fraction form
    19,611.45/29,409.80 = 7,128.39/x
  3. Step 3: Cross multiply
    19,611.45x = 29,409.80 × 7,128.39
  4. Step 4: Simplify right side
    19,611.45x = 209,644,542.04
  5. Step 5: Solve for x
    x = 209,644,542.04/19,611.45
  6. Step 6: Final answer
    x = 10,689.91

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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.