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Finding the Fourth Proportional to 72,914.40, 109,371.64 and 20,325.28

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Solution

The fourth proportional to 72,914.40, 109,371.64 and 20,325.28 is: 30,487.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,914.40 : 109,371.64 = 20,325.28 : x
  2. Step 2: Convert to fraction form
    72,914.40/109,371.64 = 20,325.28/x
  3. Step 3: Cross multiply
    72,914.40x = 109,371.64 × 20,325.28
  4. Step 4: Simplify right side
    72,914.40x = 2,223,009,207.06
  5. Step 5: Solve for x
    x = 2,223,009,207.06/72,914.40
  6. Step 6: Final answer
    x = 30,487.93

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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.