Home / 86,731.20-129,843.36-78,430.32

Finding the Fourth Proportional to 86,731.20, 129,843.36 and 78,430.32

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Solution

The fourth proportional to 86,731.20, 129,843.36 and 78,430.32 is: 117,416.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,731.20 : 129,843.36 = 78,430.32 : x
  2. Step 2: Convert to fraction form
    86,731.20/129,843.36 = 78,430.32/x
  3. Step 3: Cross multiply
    86,731.20x = 129,843.36 × 78,430.32
  4. Step 4: Simplify right side
    86,731.20x = 10,183,656,274.68
  5. Step 5: Solve for x
    x = 10,183,656,274.68/86,731.20
  6. Step 6: Final answer
    x = 117,416.30

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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.