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Finding the Fourth Proportional to 90,636.70, 135,955.05 and 89,980.60

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Solution

The fourth proportional to 90,636.70, 135,955.05 and 89,980.60 is: 134,970.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,636.70 : 135,955.05 = 89,980.60 : x
  2. Step 2: Convert to fraction form
    90,636.70/135,955.05 = 89,980.60/x
  3. Step 3: Cross multiply
    90,636.70x = 135,955.05 × 89,980.60
  4. Step 4: Simplify right side
    90,636.70x = 12,233,316,972.03
  5. Step 5: Solve for x
    x = 12,233,316,972.03/90,636.70
  6. Step 6: Final answer
    x = 134,970.90

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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.