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Finding the Fourth Proportional to 28,972.80, 43,408.80 and 13,358.40

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Solution

The fourth proportional to 28,972.80, 43,408.80 and 13,358.40 is: 20,014.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,972.80 : 43,408.80 = 13,358.40 : x
  2. Step 2: Convert to fraction form
    28,972.80/43,408.80 = 13,358.40/x
  3. Step 3: Cross multiply
    28,972.80x = 43,408.80 × 13,358.40
  4. Step 4: Simplify right side
    28,972.80x = 579,872,113.92
  5. Step 5: Solve for x
    x = 579,872,113.92/28,972.80
  6. Step 6: Final answer
    x = 20,014.36

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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.