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Finding the Fourth Proportional to 81,575.81, 112,575.72 and 61,121.59

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Solution

The fourth proportional to 81,575.81, 112,575.72 and 61,121.59 is: 84,348.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,575.81 : 112,575.72 = 61,121.59 : x
  2. Step 2: Convert to fraction form
    81,575.81/112,575.72 = 61,121.59/x
  3. Step 3: Cross multiply
    81,575.81x = 112,575.72 × 61,121.59
  4. Step 4: Simplify right side
    81,575.81x = 6,880,806,949.56
  5. Step 5: Solve for x
    x = 6,880,806,949.56/81,575.81
  6. Step 6: Final answer
    x = 84,348.62

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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.