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Finding the Fourth Proportional to 58,986.18, 81,415.80 and 39,871.80

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Solution

The fourth proportional to 58,986.18, 81,415.80 and 39,871.80 is: 55,033.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,986.18 : 81,415.80 = 39,871.80 : x
  2. Step 2: Convert to fraction form
    58,986.18/81,415.80 = 39,871.80/x
  3. Step 3: Cross multiply
    58,986.18x = 81,415.80 × 39,871.80
  4. Step 4: Simplify right side
    58,986.18x = 3,246,194,494.44
  5. Step 5: Solve for x
    x = 3,246,194,494.44/58,986.18
  6. Step 6: Final answer
    x = 55,033.14

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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.