Home / 90,348.21-135,533.25-85,372.79

Finding the Fourth Proportional to 90,348.21, 135,533.25 and 85,372.79

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Solution

The fourth proportional to 90,348.21, 135,533.25 and 85,372.79 is: 128,069.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,348.21 : 135,533.25 = 85,372.79 : x
  2. Step 2: Convert to fraction form
    90,348.21/135,533.25 = 85,372.79/x
  3. Step 3: Cross multiply
    90,348.21x = 135,533.25 × 85,372.79
  4. Step 4: Simplify right side
    90,348.21x = 11,570,851,012.60
  5. Step 5: Solve for x
    x = 11,570,851,012.60/90,348.21
  6. Step 6: Final answer
    x = 128,069.51

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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.