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Finding the Fourth Proportional to 47,486.60, 71,172.30 and 21,163.40

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Solution

The fourth proportional to 47,486.60, 71,172.30 and 21,163.40 is: 31,719.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,486.60 : 71,172.30 = 21,163.40 : x
  2. Step 2: Convert to fraction form
    47,486.60/71,172.30 = 21,163.40/x
  3. Step 3: Cross multiply
    47,486.60x = 71,172.30 × 21,163.40
  4. Step 4: Simplify right side
    47,486.60x = 1,506,247,853.82
  5. Step 5: Solve for x
    x = 1,506,247,853.82/47,486.60
  6. Step 6: Final answer
    x = 31,719.43

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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.