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Finding the Fourth Proportional to 28,978.61, 39,987.79 and 16,403.36

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Solution

The fourth proportional to 28,978.61, 39,987.79 and 16,403.36 is: 22,635.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.61 : 39,987.79 = 16,403.36 : x
  2. Step 2: Convert to fraction form
    28,978.61/39,987.79 = 16,403.36/x
  3. Step 3: Cross multiply
    28,978.61x = 39,987.79 × 16,403.36
  4. Step 4: Simplify right side
    28,978.61x = 655,934,114.97
  5. Step 5: Solve for x
    x = 655,934,114.97/28,978.61
  6. Step 6: Final answer
    x = 22,635.11

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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.