Home / 89,986.60-134,979.90-72,490.60

Finding the Fourth Proportional to 89,986.60, 134,979.90 and 72,490.60

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Solution

The fourth proportional to 89,986.60, 134,979.90 and 72,490.60 is: 108,735.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,986.60 : 134,979.90 = 72,490.60 : x
  2. Step 2: Convert to fraction form
    89,986.60/134,979.90 = 72,490.60/x
  3. Step 3: Cross multiply
    89,986.60x = 134,979.90 × 72,490.60
  4. Step 4: Simplify right side
    89,986.60x = 9,784,773,938.94
  5. Step 5: Solve for x
    x = 9,784,773,938.94/89,986.60
  6. Step 6: Final answer
    x = 108,735.90

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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.