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Finding the Fourth Proportional to 58,661.12, 81,019.16 and 39,765.44

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Solution

The fourth proportional to 58,661.12, 81,019.16 and 39,765.44 is: 54,921.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,661.12 : 81,019.16 = 39,765.44 : x
  2. Step 2: Convert to fraction form
    58,661.12/81,019.16 = 39,765.44/x
  3. Step 3: Cross multiply
    58,661.12x = 81,019.16 × 39,765.44
  4. Step 4: Simplify right side
    58,661.12x = 3,221,762,091.03
  5. Step 5: Solve for x
    x = 3,221,762,091.03/58,661.12
  6. Step 6: Final answer
    x = 54,921.60

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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.