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Finding the Fourth Proportional to 81,611.10, 112,619.97 and 47,621.48

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Solution

The fourth proportional to 81,611.10, 112,619.97 and 47,621.48 is: 65,715.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,611.10 : 112,619.97 = 47,621.48 : x
  2. Step 2: Convert to fraction form
    81,611.10/112,619.97 = 47,621.48/x
  3. Step 3: Cross multiply
    81,611.10x = 112,619.97 × 47,621.48
  4. Step 4: Simplify right side
    81,611.10x = 5,363,129,085.86
  5. Step 5: Solve for x
    x = 5,363,129,085.86/81,611.10
  6. Step 6: Final answer
    x = 65,715.68

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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.