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Finding the Fourth Proportional to 71,641.67, 98,866.40 and 39,379.81

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Solution

The fourth proportional to 71,641.67, 98,866.40 and 39,379.81 is: 54,344.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,641.67 : 98,866.40 = 39,379.81 : x
  2. Step 2: Convert to fraction form
    71,641.67/98,866.40 = 39,379.81/x
  3. Step 3: Cross multiply
    71,641.67x = 98,866.40 × 39,379.81
  4. Step 4: Simplify right side
    71,641.67x = 3,893,340,047.38
  5. Step 5: Solve for x
    x = 3,893,340,047.38/71,641.67
  6. Step 6: Final answer
    x = 54,344.63

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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.