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Finding the Fourth Proportional to 86,579.74, 119,409.42 and 72,729.28

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Solution

The fourth proportional to 86,579.74, 119,409.42 and 72,729.28 is: 100,307.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,579.74 : 119,409.42 = 72,729.28 : x
  2. Step 2: Convert to fraction form
    86,579.74/119,409.42 = 72,729.28/x
  3. Step 3: Cross multiply
    86,579.74x = 119,409.42 × 72,729.28
  4. Step 4: Simplify right side
    86,579.74x = 8,684,561,141.82
  5. Step 5: Solve for x
    x = 8,684,561,141.82/86,579.74
  6. Step 6: Final answer
    x = 100,307.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.