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Finding the Fourth Proportional to 86,674.80, 130,012.20 and 53,286.60

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Solution

The fourth proportional to 86,674.80, 130,012.20 and 53,286.60 is: 79,929.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,674.80 : 130,012.20 = 53,286.60 : x
  2. Step 2: Convert to fraction form
    86,674.80/130,012.20 = 53,286.60/x
  3. Step 3: Cross multiply
    86,674.80x = 130,012.20 × 53,286.60
  4. Step 4: Simplify right side
    86,674.80x = 6,927,908,096.52
  5. Step 5: Solve for x
    x = 6,927,908,096.52/86,674.80
  6. Step 6: Final answer
    x = 79,929.90

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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.