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Finding the Fourth Proportional to 28,919, 39,908.28 and 15,671

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Solution

The fourth proportional to 28,919, 39,908.28 and 15,671 is: 21,626.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,919 : 39,908.28 = 15,671 : x
  2. Step 2: Convert to fraction form
    28,919/39,908.28 = 15,671/x
  3. Step 3: Cross multiply
    28,919x = 39,908.28 × 15,671
  4. Step 4: Simplify right side
    28,919x = 625,402,655.88
  5. Step 5: Solve for x
    x = 625,402,655.88/28,919
  6. Step 6: Final answer
    x = 21,626.01

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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.