Home / 81,172.45-121,758.72-53,116.12

Finding the Fourth Proportional to 81,172.45, 121,758.72 and 53,116.12

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Solution

The fourth proportional to 81,172.45, 121,758.72 and 53,116.12 is: 79,674.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,172.45 : 121,758.72 = 53,116.12 : x
  2. Step 2: Convert to fraction form
    81,172.45/121,758.72 = 53,116.12/x
  3. Step 3: Cross multiply
    81,172.45x = 121,758.72 × 53,116.12
  4. Step 4: Simplify right side
    81,172.45x = 6,467,350,782.57
  5. Step 5: Solve for x
    x = 6,467,350,782.57/81,172.45
  6. Step 6: Final answer
    x = 79,674.21

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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.