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Finding the Fourth Proportional to 86,744.64, 130,016.56 and 39,899.20

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Solution

The fourth proportional to 86,744.64, 130,016.56 and 39,899.20 is: 59,802.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,744.64 : 130,016.56 = 39,899.20 : x
  2. Step 2: Convert to fraction form
    86,744.64/130,016.56 = 39,899.20/x
  3. Step 3: Cross multiply
    86,744.64x = 130,016.56 × 39,899.20
  4. Step 4: Simplify right side
    86,744.64x = 5,187,556,730.75
  5. Step 5: Solve for x
    x = 5,187,556,730.75/86,744.64
  6. Step 6: Final answer
    x = 59,802.62

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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.