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Finding the Fourth Proportional to 74,581.20, 111,871.80 and 21,990.60

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Solution

The fourth proportional to 74,581.20, 111,871.80 and 21,990.60 is: 32,985.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,581.20 : 111,871.80 = 21,990.60 : x
  2. Step 2: Convert to fraction form
    74,581.20/111,871.80 = 21,990.60/x
  3. Step 3: Cross multiply
    74,581.20x = 111,871.80 × 21,990.60
  4. Step 4: Simplify right side
    74,581.20x = 2,460,128,005.08
  5. Step 5: Solve for x
    x = 2,460,128,005.08/74,581.20
  6. Step 6: Final answer
    x = 32,985.90

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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.