Home / 86,621.81-129,932.72-20,957.81

Finding the Fourth Proportional to 86,621.81, 129,932.72 and 20,957.81

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Solution

The fourth proportional to 86,621.81, 129,932.72 and 20,957.81 is: 31,436.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,621.81 : 129,932.72 = 20,957.81 : x
  2. Step 2: Convert to fraction form
    86,621.81/129,932.72 = 20,957.81/x
  3. Step 3: Cross multiply
    86,621.81x = 129,932.72 × 20,957.81
  4. Step 4: Simplify right side
    86,621.81x = 2,723,105,661.97
  5. Step 5: Solve for x
    x = 2,723,105,661.97/86,621.81
  6. Step 6: Final answer
    x = 31,436.72

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.