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Finding the Fourth Proportional to 81,603.90, 122,355.90 and 74,642.58

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Solution

The fourth proportional to 81,603.90, 122,355.90 and 74,642.58 is: 111,918.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,603.90 : 122,355.90 = 74,642.58 : x
  2. Step 2: Convert to fraction form
    81,603.90/122,355.90 = 74,642.58/x
  3. Step 3: Cross multiply
    81,603.90x = 122,355.90 × 74,642.58
  4. Step 4: Simplify right side
    81,603.90x = 9,132,960,054.22
  5. Step 5: Solve for x
    x = 9,132,960,054.22/81,603.90
  6. Step 6: Final answer
    x = 111,918.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.