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Finding the Fourth Proportional to 86,991.92, 130,394.60 and 56,994.83

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Solution

The fourth proportional to 86,991.92, 130,394.60 and 56,994.83 is: 85,431.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,991.92 : 130,394.60 = 56,994.83 : x
  2. Step 2: Convert to fraction form
    86,991.92/130,394.60 = 56,994.83/x
  3. Step 3: Cross multiply
    86,991.92x = 130,394.60 × 56,994.83
  4. Step 4: Simplify right side
    86,991.92x = 7,431,818,059.92
  5. Step 5: Solve for x
    x = 7,431,818,059.92/86,991.92
  6. Step 6: Final answer
    x = 85,431.13

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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.