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Finding the Fourth Proportional to 86,858.91, 130,872.29 and 78,548.31

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Solution

The fourth proportional to 86,858.91, 130,872.29 and 78,548.31 is: 118,350.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,858.91 : 130,872.29 = 78,548.31 : x
  2. Step 2: Convert to fraction form
    86,858.91/130,872.29 = 78,548.31/x
  3. Step 3: Cross multiply
    86,858.91x = 130,872.29 × 78,548.31
  4. Step 4: Simplify right side
    86,858.91x = 10,279,796,812.59
  5. Step 5: Solve for x
    x = 10,279,796,812.59/86,858.91
  6. Step 6: Final answer
    x = 118,350.52

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.