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Finding the Fourth Proportional to 86,668.88, 130,003.31 and 21,004.88

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Solution

The fourth proportional to 86,668.88, 130,003.31 and 21,004.88 is: 31,507.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,668.88 : 130,003.31 = 21,004.88 : x
  2. Step 2: Convert to fraction form
    86,668.88/130,003.31 = 21,004.88/x
  3. Step 3: Cross multiply
    86,668.88x = 130,003.31 × 21,004.88
  4. Step 4: Simplify right side
    86,668.88x = 2,730,703,328.65
  5. Step 5: Solve for x
    x = 2,730,703,328.65/86,668.88
  6. Step 6: Final answer
    x = 31,507.31

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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.