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Finding the Fourth Proportional to 201,705.40, 302,558.10 and 138,719.80

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Solution

The fourth proportional to 201,705.40, 302,558.10 and 138,719.80 is: 208,079.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    201,705.40 : 302,558.10 = 138,719.80 : x
  2. Step 2: Convert to fraction form
    201,705.40/302,558.10 = 138,719.80/x
  3. Step 3: Cross multiply
    201,705.40x = 302,558.10 × 138,719.80
  4. Step 4: Simplify right side
    201,705.40x = 41,970,799,120.38
  5. Step 5: Solve for x
    x = 41,970,799,120.38/201,705.40
  6. Step 6: Final answer
    x = 208,079.70

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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.