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Finding the Fourth Proportional to 19,720.40, 29,537.40 and 17,128.40

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Solution

The fourth proportional to 19,720.40, 29,537.40 and 17,128.40 is: 25,655.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,720.40 : 29,537.40 = 17,128.40 : x
  2. Step 2: Convert to fraction form
    19,720.40/29,537.40 = 17,128.40/x
  3. Step 3: Cross multiply
    19,720.40x = 29,537.40 × 17,128.40
  4. Step 4: Simplify right side
    19,720.40x = 505,928,402.16
  5. Step 5: Solve for x
    x = 505,928,402.16/19,720.40
  6. Step 6: Final answer
    x = 25,655.08

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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.