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Finding the Fourth Proportional to 28,904.80, 43,408.40 and 21,122.40

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Solution

The fourth proportional to 28,904.80, 43,408.40 and 21,122.40 is: 31,721.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,904.80 : 43,408.40 = 21,122.40 : x
  2. Step 2: Convert to fraction form
    28,904.80/43,408.40 = 21,122.40/x
  3. Step 3: Cross multiply
    28,904.80x = 43,408.40 × 21,122.40
  4. Step 4: Simplify right side
    28,904.80x = 916,889,588.16
  5. Step 5: Solve for x
    x = 916,889,588.16/28,904.80
  6. Step 6: Final answer
    x = 31,721.01

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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.