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Finding the Fourth Proportional to 71,389.72, 107,099.90 and 21,465.64

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Solution

The fourth proportional to 71,389.72, 107,099.90 and 21,465.64 is: 32,203.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,389.72 : 107,099.90 = 21,465.64 : x
  2. Step 2: Convert to fraction form
    71,389.72/107,099.90 = 21,465.64/x
  3. Step 3: Cross multiply
    71,389.72x = 107,099.90 × 21,465.64
  4. Step 4: Simplify right side
    71,389.72x = 2,298,967,897.44
  5. Step 5: Solve for x
    x = 2,298,967,897.44/71,389.72
  6. Step 6: Final answer
    x = 32,203.07

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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.