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Finding the Fourth Proportional to 90,857.40, 136,415.70 and 68,825.40

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Solution

The fourth proportional to 90,857.40, 136,415.70 and 68,825.40 is: 103,336.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,857.40 : 136,415.70 = 68,825.40 : x
  2. Step 2: Convert to fraction form
    90,857.40/136,415.70 = 68,825.40/x
  3. Step 3: Cross multiply
    90,857.40x = 136,415.70 × 68,825.40
  4. Step 4: Simplify right side
    90,857.40x = 9,388,865,118.78
  5. Step 5: Solve for x
    x = 9,388,865,118.78/90,857.40
  6. Step 6: Final answer
    x = 103,336.27

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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.