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Finding the Fourth Proportional to 43,142.76, 64,721.52 and 19,771.20

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Solution

The fourth proportional to 43,142.76, 64,721.52 and 19,771.20 is: 29,660.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,142.76 : 64,721.52 = 19,771.20 : x
  2. Step 2: Convert to fraction form
    43,142.76/64,721.52 = 19,771.20/x
  3. Step 3: Cross multiply
    43,142.76x = 64,721.52 × 19,771.20
  4. Step 4: Simplify right side
    43,142.76x = 1,279,622,116.22
  5. Step 5: Solve for x
    x = 1,279,622,116.22/43,142.76
  6. Step 6: Final answer
    x = 29,660.18

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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.