Home / 100,220.70-138,316.23-57,780.75

Finding the Fourth Proportional to 100,220.70, 138,316.23 and 57,780.75

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Solution

The fourth proportional to 100,220.70, 138,316.23 and 57,780.75 is: 79,744.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,220.70 : 138,316.23 = 57,780.75 : x
  2. Step 2: Convert to fraction form
    100,220.70/138,316.23 = 57,780.75/x
  3. Step 3: Cross multiply
    100,220.70x = 138,316.23 × 57,780.75
  4. Step 4: Simplify right side
    100,220.70x = 7,992,015,506.57
  5. Step 5: Solve for x
    x = 7,992,015,506.57/100,220.70
  6. Step 6: Final answer
    x = 79,744.16

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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.