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Finding the Fourth Proportional to 309,656.70, 464,486.49 and 85,020.30

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Solution

The fourth proportional to 309,656.70, 464,486.49 and 85,020.30 is: 127,530.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,656.70 : 464,486.49 = 85,020.30 : x
  2. Step 2: Convert to fraction form
    309,656.70/464,486.49 = 85,020.30/x
  3. Step 3: Cross multiply
    309,656.70x = 464,486.49 × 85,020.30
  4. Step 4: Simplify right side
    309,656.70x = 39,490,780,725.75
  5. Step 5: Solve for x
    x = 39,490,780,725.75/309,656.70
  6. Step 6: Final answer
    x = 127,530.85

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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.