Home / 100,221.09-138,307.34-57,199.72

Finding the Fourth Proportional to 100,221.09, 138,307.34 and 57,199.72

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Solution

The fourth proportional to 100,221.09, 138,307.34 and 57,199.72 is: 78,936.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,221.09 : 138,307.34 = 57,199.72 : x
  2. Step 2: Convert to fraction form
    100,221.09/138,307.34 = 57,199.72/x
  3. Step 3: Cross multiply
    100,221.09x = 138,307.34 × 57,199.72
  4. Step 4: Simplify right side
    100,221.09x = 7,911,141,121.94
  5. Step 5: Solve for x
    x = 7,911,141,121.94/100,221.09
  6. Step 6: Final answer
    x = 78,936.89

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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.