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Finding the Fourth Proportional to 65,664.51, 90,620.42 and 40,162.88

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Solution

The fourth proportional to 65,664.51, 90,620.42 and 40,162.88 is: 55,426.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,664.51 : 90,620.42 = 40,162.88 : x
  2. Step 2: Convert to fraction form
    65,664.51/90,620.42 = 40,162.88/x
  3. Step 3: Cross multiply
    65,664.51x = 90,620.42 × 40,162.88
  4. Step 4: Simplify right side
    65,664.51x = 3,639,576,600.91
  5. Step 5: Solve for x
    x = 3,639,576,600.91/65,664.51
  6. Step 6: Final answer
    x = 55,426.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.