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Finding the Fourth Proportional to 201,905.90, 302,858.85 and 138,920.30

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Solution

The fourth proportional to 201,905.90, 302,858.85 and 138,920.30 is: 208,380.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    201,905.90 : 302,858.85 = 138,920.30 : x
  2. Step 2: Convert to fraction form
    201,905.90/302,858.85 = 138,920.30/x
  3. Step 3: Cross multiply
    201,905.90x = 302,858.85 × 138,920.30
  4. Step 4: Simplify right side
    201,905.90x = 42,073,242,299.66
  5. Step 5: Solve for x
    x = 42,073,242,299.66/201,905.90
  6. Step 6: Final answer
    x = 208,380.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.