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Finding the Fourth Proportional to 91,363.20, 137,044.80 and 80,918.40

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Solution

The fourth proportional to 91,363.20, 137,044.80 and 80,918.40 is: 121,377.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,363.20 : 137,044.80 = 80,918.40 : x
  2. Step 2: Convert to fraction form
    91,363.20/137,044.80 = 80,918.40/x
  3. Step 3: Cross multiply
    91,363.20x = 137,044.80 × 80,918.40
  4. Step 4: Simplify right side
    91,363.20x = 11,089,445,944.32
  5. Step 5: Solve for x
    x = 11,089,445,944.32/91,363.20
  6. Step 6: Final answer
    x = 121,377.60

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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.