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Finding the Fourth Proportional to 58,661.49, 81,019.68 and 39,765.81

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Solution

The fourth proportional to 58,661.49, 81,019.68 and 39,765.81 is: 54,922.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,661.49 : 81,019.68 = 39,765.81 : x
  2. Step 2: Convert to fraction form
    58,661.49/81,019.68 = 39,765.81/x
  3. Step 3: Cross multiply
    58,661.49x = 81,019.68 × 39,765.81
  4. Step 4: Simplify right side
    58,661.49x = 3,221,813,201.14
  5. Step 5: Solve for x
    x = 3,221,813,201.14/58,661.49
  6. Step 6: Final answer
    x = 54,922.12

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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.