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Finding the Fourth Proportional to 345,615, 518,422.50 and 82,959

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Solution

The fourth proportional to 345,615, 518,422.50 and 82,959 is: 124,438.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    345,615 : 518,422.50 = 82,959 : x
  2. Step 2: Convert to fraction form
    345,615/518,422.50 = 82,959/x
  3. Step 3: Cross multiply
    345,615x = 518,422.50 × 82,959
  4. Step 4: Simplify right side
    345,615x = 43,007,812,177.50
  5. Step 5: Solve for x
    x = 43,007,812,177.50/345,615
  6. Step 6: Final answer
    x = 124,438.50

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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.