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Finding the Fourth Proportional to 90,861.40, 136,421.70 and 68,829.40

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Solution

The fourth proportional to 90,861.40, 136,421.70 and 68,829.40 is: 103,342.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,861.40 : 136,421.70 = 68,829.40 : x
  2. Step 2: Convert to fraction form
    90,861.40/136,421.70 = 68,829.40/x
  3. Step 3: Cross multiply
    90,861.40x = 136,421.70 × 68,829.40
  4. Step 4: Simplify right side
    90,861.40x = 9,389,823,757.98
  5. Step 5: Solve for x
    x = 9,389,823,757.98/90,861.40
  6. Step 6: Final answer
    x = 103,342.27

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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.