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Finding the Fourth Proportional to 58,886.72, 81,140.64 and 39,991.04

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Solution

The fourth proportional to 58,886.72, 81,140.64 and 39,991.04 is: 55,104.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,886.72 : 81,140.64 = 39,991.04 : x
  2. Step 2: Convert to fraction form
    58,886.72/81,140.64 = 39,991.04/x
  3. Step 3: Cross multiply
    58,886.72x = 81,140.64 × 39,991.04
  4. Step 4: Simplify right side
    58,886.72x = 3,244,898,579.87
  5. Step 5: Solve for x
    x = 3,244,898,579.87/58,886.72
  6. Step 6: Final answer
    x = 55,104.08

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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.