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Finding the Fourth Proportional to 321,803.70, 482,705.55 and 85,170.30

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Solution

The fourth proportional to 321,803.70, 482,705.55 and 85,170.30 is: 127,755.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,803.70 : 482,705.55 = 85,170.30 : x
  2. Step 2: Convert to fraction form
    321,803.70/482,705.55 = 85,170.30/x
  3. Step 3: Cross multiply
    321,803.70x = 482,705.55 × 85,170.30
  4. Step 4: Simplify right side
    321,803.70x = 41,112,176,505.17
  5. Step 5: Solve for x
    x = 41,112,176,505.17/321,803.70
  6. Step 6: Final answer
    x = 127,755.45

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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.