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Finding the Fourth Proportional to 81,212.76, 121,855.52 and 51,622.92

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Solution

The fourth proportional to 81,212.76, 121,855.52 and 51,622.92 is: 77,457.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,212.76 : 121,855.52 = 51,622.92 : x
  2. Step 2: Convert to fraction form
    81,212.76/121,855.52 = 51,622.92/x
  3. Step 3: Cross multiply
    81,212.76x = 121,855.52 × 51,622.92
  4. Step 4: Simplify right side
    81,212.76x = 6,290,537,760.52
  5. Step 5: Solve for x
    x = 6,290,537,760.52/81,212.76
  6. Step 6: Final answer
    x = 77,457.50

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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.