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Finding the Fourth Proportional to 86,900.80, 130,156.80 and 71,348.80

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Solution

The fourth proportional to 86,900.80, 130,156.80 and 71,348.80 is: 106,863.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,900.80 : 130,156.80 = 71,348.80 : x
  2. Step 2: Convert to fraction form
    86,900.80/130,156.80 = 71,348.80/x
  3. Step 3: Cross multiply
    86,900.80x = 130,156.80 × 71,348.80
  4. Step 4: Simplify right side
    86,900.80x = 9,286,531,491.84
  5. Step 5: Solve for x
    x = 9,286,531,491.84/86,900.80
  6. Step 6: Final answer
    x = 106,863.59

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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.