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Finding the Fourth Proportional to 405,991.40, 608,727.90 and 169,428.20

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Solution

The fourth proportional to 405,991.40, 608,727.90 and 169,428.20 is: 254,034.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,991.40 : 608,727.90 = 169,428.20 : x
  2. Step 2: Convert to fraction form
    405,991.40/608,727.90 = 169,428.20/x
  3. Step 3: Cross multiply
    405,991.40x = 608,727.90 × 169,428.20
  4. Step 4: Simplify right side
    405,991.40x = 103,135,672,386.78
  5. Step 5: Solve for x
    x = 103,135,672,386.78/405,991.40
  6. Step 6: Final answer
    x = 254,034.13

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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.