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Finding the Fourth Proportional to 420,999.48, 631,598.46 and 136,668.12

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Solution

The fourth proportional to 420,999.48, 631,598.46 and 136,668.12 is: 205,034.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,999.48 : 631,598.46 = 136,668.12 : x
  2. Step 2: Convert to fraction form
    420,999.48/631,598.46 = 136,668.12/x
  3. Step 3: Cross multiply
    420,999.48x = 631,598.46 × 136,668.12
  4. Step 4: Simplify right side
    420,999.48x = 86,319,374,123.10
  5. Step 5: Solve for x
    x = 86,319,374,123.10/420,999.48
  6. Step 6: Final answer
    x = 205,034.40

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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.