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Finding the Fourth Proportional to 405,428.80, 608,085.60 and 139,201.60

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Solution

The fourth proportional to 405,428.80, 608,085.60 and 139,201.60 is: 208,782.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,428.80 : 608,085.60 = 139,201.60 : x
  2. Step 2: Convert to fraction form
    405,428.80/608,085.60 = 139,201.60/x
  3. Step 3: Cross multiply
    405,428.80x = 608,085.60 × 139,201.60
  4. Step 4: Simplify right side
    405,428.80x = 84,646,488,456.96
  5. Step 5: Solve for x
    x = 84,646,488,456.96/405,428.80
  6. Step 6: Final answer
    x = 208,782.62

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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.