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Finding the Fourth Proportional to 90,394.40, 135,613.20 and 43,608.80

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Solution

The fourth proportional to 90,394.40, 135,613.20 and 43,608.80 is: 65,423.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,394.40 : 135,613.20 = 43,608.80 : x
  2. Step 2: Convert to fraction form
    90,394.40/135,613.20 = 43,608.80/x
  3. Step 3: Cross multiply
    90,394.40x = 135,613.20 × 43,608.80
  4. Step 4: Simplify right side
    90,394.40x = 5,913,928,916.16
  5. Step 5: Solve for x
    x = 5,913,928,916.16/90,394.40
  6. Step 6: Final answer
    x = 65,423.62

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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.