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Finding the Fourth Proportional to 309,689.06, 464,532.60 and 85,049.72

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Solution

The fourth proportional to 309,689.06, 464,532.60 and 85,049.72 is: 127,574.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,689.06 : 464,532.60 = 85,049.72 : x
  2. Step 2: Convert to fraction form
    309,689.06/464,532.60 = 85,049.72/x
  3. Step 3: Cross multiply
    309,689.06x = 464,532.60 × 85,049.72
  4. Step 4: Simplify right side
    309,689.06x = 39,508,367,560.87
  5. Step 5: Solve for x
    x = 39,508,367,560.87/309,689.06
  6. Step 6: Final answer
    x = 127,574.31

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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.