Home / 86,854.20-130,500-55,278.78

Finding the Fourth Proportional to 86,854.20, 130,500 and 55,278.78

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Solution

The fourth proportional to 86,854.20, 130,500 and 55,278.78 is: 83,057.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,854.20 : 130,500 = 55,278.78 : x
  2. Step 2: Convert to fraction form
    86,854.20/130,500 = 55,278.78/x
  3. Step 3: Cross multiply
    86,854.20x = 130,500 × 55,278.78
  4. Step 4: Simplify right side
    86,854.20x = 7,213,880,790
  5. Step 5: Solve for x
    x = 7,213,880,790/86,854.20
  6. Step 6: Final answer
    x = 83,057.36

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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.