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Finding the Fourth Proportional to 84,603.70, 127,051.80 and 81,979.30

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Solution

The fourth proportional to 84,603.70, 127,051.80 and 81,979.30 is: 123,110.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,603.70 : 127,051.80 = 81,979.30 : x
  2. Step 2: Convert to fraction form
    84,603.70/127,051.80 = 81,979.30/x
  3. Step 3: Cross multiply
    84,603.70x = 127,051.80 × 81,979.30
  4. Step 4: Simplify right side
    84,603.70x = 10,415,617,627.74
  5. Step 5: Solve for x
    x = 10,415,617,627.74/84,603.70
  6. Step 6: Final answer
    x = 123,110.66

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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.