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Finding the Fourth Proportional to 218,962.74, 302,170.74 and 128,372.34

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Solution

The fourth proportional to 218,962.74, 302,170.74 and 128,372.34 is: 177,155.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,962.74 : 302,170.74 = 128,372.34 : x
  2. Step 2: Convert to fraction form
    218,962.74/302,170.74 = 128,372.34/x
  3. Step 3: Cross multiply
    218,962.74x = 302,170.74 × 128,372.34
  4. Step 4: Simplify right side
    218,962.74x = 38,790,364,973.33
  5. Step 5: Solve for x
    x = 38,790,364,973.33/218,962.74
  6. Step 6: Final answer
    x = 177,155.09

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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.