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Finding the Fourth Proportional to 66,904.70, 100,357.05 and 66,443.90

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Solution

The fourth proportional to 66,904.70, 100,357.05 and 66,443.90 is: 99,665.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,904.70 : 100,357.05 = 66,443.90 : x
  2. Step 2: Convert to fraction form
    66,904.70/100,357.05 = 66,443.90/x
  3. Step 3: Cross multiply
    66,904.70x = 100,357.05 × 66,443.90
  4. Step 4: Simplify right side
    66,904.70x = 6,668,113,794.50
  5. Step 5: Solve for x
    x = 6,668,113,794.50/66,904.70
  6. Step 6: Final answer
    x = 99,665.85

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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.