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Finding the Fourth Proportional to 86,887.65, 130,423.65 and 76,956.87

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Solution

The fourth proportional to 86,887.65, 130,423.65 and 76,956.87 is: 115,516.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,887.65 : 130,423.65 = 76,956.87 : x
  2. Step 2: Convert to fraction form
    86,887.65/130,423.65 = 76,956.87/x
  3. Step 3: Cross multiply
    86,887.65x = 130,423.65 × 76,956.87
  4. Step 4: Simplify right side
    86,887.65x = 10,036,995,877.98
  5. Step 5: Solve for x
    x = 10,036,995,877.98/86,887.65
  6. Step 6: Final answer
    x = 115,516.94

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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.