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Finding the Fourth Proportional to 86,751.40, 130,127.10 and 80,919.40

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Solution

The fourth proportional to 86,751.40, 130,127.10 and 80,919.40 is: 121,379.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,751.40 : 130,127.10 = 80,919.40 : x
  2. Step 2: Convert to fraction form
    86,751.40/130,127.10 = 80,919.40/x
  3. Step 3: Cross multiply
    86,751.40x = 130,127.10 × 80,919.40
  4. Step 4: Simplify right side
    86,751.40x = 10,529,806,855.74
  5. Step 5: Solve for x
    x = 10,529,806,855.74/86,751.40
  6. Step 6: Final answer
    x = 121,379.10

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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.