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Finding the Fourth Proportional to 19,953.51, 29,855.08 and 11,918.51

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Solution

The fourth proportional to 19,953.51, 29,855.08 and 11,918.51 is: 17,832.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,953.51 : 29,855.08 = 11,918.51 : x
  2. Step 2: Convert to fraction form
    19,953.51/29,855.08 = 11,918.51/x
  3. Step 3: Cross multiply
    19,953.51x = 29,855.08 × 11,918.51
  4. Step 4: Simplify right side
    19,953.51x = 355,828,047.11
  5. Step 5: Solve for x
    x = 355,828,047.11/19,953.51
  6. Step 6: Final answer
    x = 17,832.86

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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.