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Finding the Fourth Proportional to 71,670.09, 98,905.91 and 39,406.07

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Solution

The fourth proportional to 71,670.09, 98,905.91 and 39,406.07 is: 54,381.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,670.09 : 98,905.91 = 39,406.07 : x
  2. Step 2: Convert to fraction form
    71,670.09/98,905.91 = 39,406.07/x
  3. Step 3: Cross multiply
    71,670.09x = 98,905.91 × 39,406.07
  4. Step 4: Simplify right side
    71,670.09x = 3,897,493,212.87
  5. Step 5: Solve for x
    x = 3,897,493,212.87/71,670.09
  6. Step 6: Final answer
    x = 54,381.03

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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.