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Finding the Fourth Proportional to 64,879.65, 89,518.62 and 39,385.38

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Solution

The fourth proportional to 64,879.65, 89,518.62 and 39,385.38 is: 54,342.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,879.65 : 89,518.62 = 39,385.38 : x
  2. Step 2: Convert to fraction form
    64,879.65/89,518.62 = 39,385.38/x
  3. Step 3: Cross multiply
    64,879.65x = 89,518.62 × 39,385.38
  4. Step 4: Simplify right side
    64,879.65x = 3,525,724,865.78
  5. Step 5: Solve for x
    x = 3,525,724,865.78/64,879.65
  6. Step 6: Final answer
    x = 54,342.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.