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Finding the Fourth Proportional to 90,620.70, 136,076.85 and 68,459.10

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Solution

The fourth proportional to 90,620.70, 136,076.85 and 68,459.10 is: 102,798.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,620.70 : 136,076.85 = 68,459.10 : x
  2. Step 2: Convert to fraction form
    90,620.70/136,076.85 = 68,459.10/x
  3. Step 3: Cross multiply
    90,620.70x = 136,076.85 × 68,459.10
  4. Step 4: Simplify right side
    90,620.70x = 9,315,698,681.84
  5. Step 5: Solve for x
    x = 9,315,698,681.84/90,620.70
  6. Step 6: Final answer
    x = 102,798.79

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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.