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Finding the Fourth Proportional to 64,890.69, 97,289.31 and 39,879.07

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Solution

The fourth proportional to 64,890.69, 97,289.31 and 39,879.07 is: 59,789.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,890.69 : 97,289.31 = 39,879.07 : x
  2. Step 2: Convert to fraction form
    64,890.69/97,289.31 = 39,879.07/x
  3. Step 3: Cross multiply
    64,890.69x = 97,289.31 × 39,879.07
  4. Step 4: Simplify right side
    64,890.69x = 3,879,807,004.35
  5. Step 5: Solve for x
    x = 3,879,807,004.35/64,890.69
  6. Step 6: Final answer
    x = 59,789.89

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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.