Home / 81,146.70-121,720.05-78,036.30

Finding the Fourth Proportional to 81,146.70, 121,720.05 and 78,036.30

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Solution

The fourth proportional to 81,146.70, 121,720.05 and 78,036.30 is: 117,054.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,146.70 : 121,720.05 = 78,036.30 : x
  2. Step 2: Convert to fraction form
    81,146.70/121,720.05 = 78,036.30/x
  3. Step 3: Cross multiply
    81,146.70x = 121,720.05 × 78,036.30
  4. Step 4: Simplify right side
    81,146.70x = 9,498,582,337.82
  5. Step 5: Solve for x
    x = 9,498,582,337.82/81,146.70
  6. Step 6: Final answer
    x = 117,054.45

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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.