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Finding the Fourth Proportional to 100,358.68, 138,485 and 57,930.88

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Solution

The fourth proportional to 100,358.68, 138,485 and 57,930.88 is: 79,938.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,358.68 : 138,485 = 57,930.88 : x
  2. Step 2: Convert to fraction form
    100,358.68/138,485 = 57,930.88/x
  3. Step 3: Cross multiply
    100,358.68x = 138,485 × 57,930.88
  4. Step 4: Simplify right side
    100,358.68x = 8,022,557,916.80
  5. Step 5: Solve for x
    x = 8,022,557,916.80/100,358.68
  6. Step 6: Final answer
    x = 79,938.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.