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Finding the Fourth Proportional to 28,688.40, 43,081.20 and 21,301.20

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Solution

The fourth proportional to 28,688.40, 43,081.20 and 21,301.20 is: 31,987.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,688.40 : 43,081.20 = 21,301.20 : x
  2. Step 2: Convert to fraction form
    28,688.40/43,081.20 = 21,301.20/x
  3. Step 3: Cross multiply
    28,688.40x = 43,081.20 × 21,301.20
  4. Step 4: Simplify right side
    28,688.40x = 917,681,257.44
  5. Step 5: Solve for x
    x = 917,681,257.44/28,688.40
  6. Step 6: Final answer
    x = 31,987.89

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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.