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Finding the Fourth Proportional to 28,978.68, 39,988.08 and 16,877.28

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Solution

The fourth proportional to 28,978.68, 39,988.08 and 16,877.28 is: 23,289.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.68 : 39,988.08 = 16,877.28 : x
  2. Step 2: Convert to fraction form
    28,978.68/39,988.08 = 16,877.28/x
  3. Step 3: Cross multiply
    28,978.68x = 39,988.08 × 16,877.28
  4. Step 4: Simplify right side
    28,978.68x = 674,890,022.82
  5. Step 5: Solve for x
    x = 674,890,022.82/28,978.68
  6. Step 6: Final answer
    x = 23,289.19

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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.