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Finding the Fourth Proportional to 61,918.62, 85,416.39 and 39,219.54

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Solution

The fourth proportional to 61,918.62, 85,416.39 and 39,219.54 is: 54,103.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,918.62 : 85,416.39 = 39,219.54 : x
  2. Step 2: Convert to fraction form
    61,918.62/85,416.39 = 39,219.54/x
  3. Step 3: Cross multiply
    61,918.62x = 85,416.39 × 39,219.54
  4. Step 4: Simplify right side
    61,918.62x = 3,349,991,524.26
  5. Step 5: Solve for x
    x = 3,349,991,524.26/61,918.62
  6. Step 6: Final answer
    x = 54,103.14

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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.