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Finding the Fourth Proportional to 28,978.11, 39,987.10 and 16,402.86

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Solution

The fourth proportional to 28,978.11, 39,987.10 and 16,402.86 is: 22,634.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.11 : 39,987.10 = 16,402.86 : x
  2. Step 2: Convert to fraction form
    28,978.11/39,987.10 = 16,402.86/x
  3. Step 3: Cross multiply
    28,978.11x = 39,987.10 × 16,402.86
  4. Step 4: Simplify right side
    28,978.11x = 655,902,721.09
  5. Step 5: Solve for x
    x = 655,902,721.09/28,978.11
  6. Step 6: Final answer
    x = 22,634.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.