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Finding the Fourth Proportional to 74,490.40, 111,724.80 and 21,894.40

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Solution

The fourth proportional to 74,490.40, 111,724.80 and 21,894.40 is: 32,838.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,490.40 : 111,724.80 = 21,894.40 : x
  2. Step 2: Convert to fraction form
    74,490.40/111,724.80 = 21,894.40/x
  3. Step 3: Cross multiply
    74,490.40x = 111,724.80 × 21,894.40
  4. Step 4: Simplify right side
    74,490.40x = 2,446,147,461.12
  5. Step 5: Solve for x
    x = 2,446,147,461.12/74,490.40
  6. Step 6: Final answer
    x = 32,838.43

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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.