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Finding the Fourth Proportional to 86,956.98, 130,172.87 and 78,640.91

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Solution

The fourth proportional to 86,956.98, 130,172.87 and 78,640.91 is: 117,723.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,956.98 : 130,172.87 = 78,640.91 : x
  2. Step 2: Convert to fraction form
    86,956.98/130,172.87 = 78,640.91/x
  3. Step 3: Cross multiply
    86,956.98x = 130,172.87 × 78,640.91
  4. Step 4: Simplify right side
    86,956.98x = 10,236,912,988.00
  5. Step 5: Solve for x
    x = 10,236,912,988.00/86,956.98
  6. Step 6: Final answer
    x = 117,723.88

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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.