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Finding the Fourth Proportional to 70,689.61, 106,052.28 and 20,771.29

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Solution

The fourth proportional to 70,689.61, 106,052.28 and 20,771.29 is: 31,162.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,689.61 : 106,052.28 = 20,771.29 : x
  2. Step 2: Convert to fraction form
    70,689.61/106,052.28 = 20,771.29/x
  3. Step 3: Cross multiply
    70,689.61x = 106,052.28 × 20,771.29
  4. Step 4: Simplify right side
    70,689.61x = 2,202,842,663.04
  5. Step 5: Solve for x
    x = 2,202,842,663.04/70,689.61
  6. Step 6: Final answer
    x = 31,162.18

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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.