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Finding the Fourth Proportional to 305,855.80, 458,783.70 and 81,215.80

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Solution

The fourth proportional to 305,855.80, 458,783.70 and 81,215.80 is: 121,823.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,855.80 : 458,783.70 = 81,215.80 : x
  2. Step 2: Convert to fraction form
    305,855.80/458,783.70 = 81,215.80/x
  3. Step 3: Cross multiply
    305,855.80x = 458,783.70 × 81,215.80
  4. Step 4: Simplify right side
    305,855.80x = 37,260,485,222.46
  5. Step 5: Solve for x
    x = 37,260,485,222.46/305,855.80
  6. Step 6: Final answer
    x = 121,823.70

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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.