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Finding the Fourth Proportional to 100,153.76, 138,212.16 and 57,736.88

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Solution

The fourth proportional to 100,153.76, 138,212.16 and 57,736.88 is: 79,676.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,153.76 : 138,212.16 = 57,736.88 : x
  2. Step 2: Convert to fraction form
    100,153.76/138,212.16 = 57,736.88/x
  3. Step 3: Cross multiply
    100,153.76x = 138,212.16 × 57,736.88
  4. Step 4: Simplify right side
    100,153.76x = 7,979,938,896.46
  5. Step 5: Solve for x
    x = 7,979,938,896.46/100,153.76
  6. Step 6: Final answer
    x = 79,676.88

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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.