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Finding the Fourth Proportional to 68,289.62, 102,430.76 and 20,904.72

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Solution

The fourth proportional to 68,289.62, 102,430.76 and 20,904.72 is: 31,355.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,289.62 : 102,430.76 = 20,904.72 : x
  2. Step 2: Convert to fraction form
    68,289.62/102,430.76 = 20,904.72/x
  3. Step 3: Cross multiply
    68,289.62x = 102,430.76 × 20,904.72
  4. Step 4: Simplify right side
    68,289.62x = 2,141,286,357.19
  5. Step 5: Solve for x
    x = 2,141,286,357.19/68,289.62
  6. Step 6: Final answer
    x = 31,355.96

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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.