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Finding the Fourth Proportional to 90,615.64, 135,923.46 and 28,291.48

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Solution

The fourth proportional to 90,615.64, 135,923.46 and 28,291.48 is: 42,437.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,615.64 : 135,923.46 = 28,291.48 : x
  2. Step 2: Convert to fraction form
    90,615.64/135,923.46 = 28,291.48/x
  3. Step 3: Cross multiply
    90,615.64x = 135,923.46 × 28,291.48
  4. Step 4: Simplify right side
    90,615.64x = 3,845,475,850.12
  5. Step 5: Solve for x
    x = 3,845,475,850.12/90,615.64
  6. Step 6: Final answer
    x = 42,437.22

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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.