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Finding the Fourth Proportional to 71,605.56, 98,812.32 and 39,776.40

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Solution

The fourth proportional to 71,605.56, 98,812.32 and 39,776.40 is: 54,889.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,605.56 : 98,812.32 = 39,776.40 : x
  2. Step 2: Convert to fraction form
    71,605.56/98,812.32 = 39,776.40/x
  3. Step 3: Cross multiply
    71,605.56x = 98,812.32 × 39,776.40
  4. Step 4: Simplify right side
    71,605.56x = 3,930,398,365.25
  5. Step 5: Solve for x
    x = 3,930,398,365.25/71,605.56
  6. Step 6: Final answer
    x = 54,889.57

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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.