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Finding the Fourth Proportional to 81,015.80, 121,523.70 and 61,332.80

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Solution

The fourth proportional to 81,015.80, 121,523.70 and 61,332.80 is: 91,999.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,015.80 : 121,523.70 = 61,332.80 : x
  2. Step 2: Convert to fraction form
    81,015.80/121,523.70 = 61,332.80/x
  3. Step 3: Cross multiply
    81,015.80x = 121,523.70 × 61,332.80
  4. Step 4: Simplify right side
    81,015.80x = 7,453,388,787.36
  5. Step 5: Solve for x
    x = 7,453,388,787.36/81,015.80
  6. Step 6: Final answer
    x = 91,999.20

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1.5x scale

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.