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Finding the Fourth Proportional to 91,273.20, 136,909.80 and 80,828.40

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Solution

The fourth proportional to 91,273.20, 136,909.80 and 80,828.40 is: 121,242.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,273.20 : 136,909.80 = 80,828.40 : x
  2. Step 2: Convert to fraction form
    91,273.20/136,909.80 = 80,828.40/x
  3. Step 3: Cross multiply
    91,273.20x = 136,909.80 × 80,828.40
  4. Step 4: Simplify right side
    91,273.20x = 11,066,200,078.32
  5. Step 5: Solve for x
    x = 11,066,200,078.32/91,273.20
  6. Step 6: Final answer
    x = 121,242.60

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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.