Home / 100,209.72-138,255.09-57,158.27

Finding the Fourth Proportional to 100,209.72, 138,255.09 and 57,158.27

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Solution

The fourth proportional to 100,209.72, 138,255.09 and 57,158.27 is: 78,858.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,209.72 : 138,255.09 = 57,158.27 : x
  2. Step 2: Convert to fraction form
    100,209.72/138,255.09 = 57,158.27/x
  3. Step 3: Cross multiply
    100,209.72x = 138,255.09 × 57,158.27
  4. Step 4: Simplify right side
    100,209.72x = 7,902,421,071.82
  5. Step 5: Solve for x
    x = 7,902,421,071.82/100,209.72
  6. Step 6: Final answer
    x = 78,858.83

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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.