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Finding the Fourth Proportional to 61,736.25, 85,215.47 and 39,380.25

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Solution

The fourth proportional to 61,736.25, 85,215.47 and 39,380.25 is: 54,357.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,736.25 : 85,215.47 = 39,380.25 : x
  2. Step 2: Convert to fraction form
    61,736.25/85,215.47 = 39,380.25/x
  3. Step 3: Cross multiply
    61,736.25x = 85,215.47 × 39,380.25
  4. Step 4: Simplify right side
    61,736.25x = 3,355,806,315.57
  5. Step 5: Solve for x
    x = 3,355,806,315.57/61,736.25
  6. Step 6: Final answer
    x = 54,357.15

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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.