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Finding the Fourth Proportional to 70,689.64, 106,012.26 and 20,757.28

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Solution

The fourth proportional to 70,689.64, 106,012.26 and 20,757.28 is: 31,129.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,689.64 : 106,012.26 = 20,757.28 : x
  2. Step 2: Convert to fraction form
    70,689.64/106,012.26 = 20,757.28/x
  3. Step 3: Cross multiply
    70,689.64x = 106,012.26 × 20,757.28
  4. Step 4: Simplify right side
    70,689.64x = 2,200,526,164.25
  5. Step 5: Solve for x
    x = 2,200,526,164.25/70,689.64
  6. Step 6: Final answer
    x = 31,129.40

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1.5x scale

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.