Home / 100,220.29-138,315.64-57,780.34

Finding the Fourth Proportional to 100,220.29, 138,315.64 and 57,780.34

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Solution

The fourth proportional to 100,220.29, 138,315.64 and 57,780.34 is: 79,743.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,220.29 : 138,315.64 = 57,780.34 : x
  2. Step 2: Convert to fraction form
    100,220.29/138,315.64 = 57,780.34/x
  3. Step 3: Cross multiply
    100,220.29x = 138,315.64 × 57,780.34
  4. Step 4: Simplify right side
    100,220.29x = 7,991,924,014.94
  5. Step 5: Solve for x
    x = 7,991,924,014.94/100,220.29
  6. Step 6: Final answer
    x = 79,743.58

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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.