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Finding the Fourth Proportional to 90,762.69, 136,043.15 and 68,503.89

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Solution

The fourth proportional to 90,762.69, 136,043.15 and 68,503.89 is: 102,679.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,762.69 : 136,043.15 = 68,503.89 : x
  2. Step 2: Convert to fraction form
    90,762.69/136,043.15 = 68,503.89/x
  3. Step 3: Cross multiply
    90,762.69x = 136,043.15 × 68,503.89
  4. Step 4: Simplify right side
    90,762.69x = 9,319,484,640.33
  5. Step 5: Solve for x
    x = 9,319,484,640.33/90,762.69
  6. Step 6: Final answer
    x = 102,679.69

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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.