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Finding the Fourth Proportional to 86,675, 130,012.52 and 21,011

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Solution

The fourth proportional to 86,675, 130,012.52 and 21,011 is: 31,516.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,675 : 130,012.52 = 21,011 : x
  2. Step 2: Convert to fraction form
    86,675/130,012.52 = 21,011/x
  3. Step 3: Cross multiply
    86,675x = 130,012.52 × 21,011
  4. Step 4: Simplify right side
    86,675x = 2,731,693,057.72
  5. Step 5: Solve for x
    x = 2,731,693,057.72/86,675
  6. Step 6: Final answer
    x = 31,516.50

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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.