Home / 86,579.40-129,869.10-76,956.60

Finding the Fourth Proportional to 86,579.40, 129,869.10 and 76,956.60

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Solution

The fourth proportional to 86,579.40, 129,869.10 and 76,956.60 is: 115,434.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,579.40 : 129,869.10 = 76,956.60 : x
  2. Step 2: Convert to fraction form
    86,579.40/129,869.10 = 76,956.60/x
  3. Step 3: Cross multiply
    86,579.40x = 129,869.10 × 76,956.60
  4. Step 4: Simplify right side
    86,579.40x = 9,994,284,381.06
  5. Step 5: Solve for x
    x = 9,994,284,381.06/86,579.40
  6. Step 6: Final answer
    x = 115,434.90

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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.