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Finding the Fourth Proportional to 90,667.60, 135,868.60 and 81,307.60

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Solution

The fourth proportional to 90,667.60, 135,868.60 and 81,307.60 is: 121,842.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,667.60 : 135,868.60 = 81,307.60 : x
  2. Step 2: Convert to fraction form
    90,667.60/135,868.60 = 81,307.60/x
  3. Step 3: Cross multiply
    90,667.60x = 135,868.60 × 81,307.60
  4. Step 4: Simplify right side
    90,667.60x = 11,047,149,781.36
  5. Step 5: Solve for x
    x = 11,047,149,781.36/90,667.60
  6. Step 6: Final answer
    x = 121,842.31

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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.