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Finding the Fourth Proportional to 405,373.28, 608,072.27 and 139,129.92

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Solution

The fourth proportional to 405,373.28, 608,072.27 and 139,129.92 is: 208,699.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,373.28 : 608,072.27 = 139,129.92 : x
  2. Step 2: Convert to fraction form
    405,373.28/608,072.27 = 139,129.92/x
  3. Step 3: Cross multiply
    405,373.28x = 608,072.27 × 139,129.92
  4. Step 4: Simplify right side
    405,373.28x = 84,601,045,583.67
  5. Step 5: Solve for x
    x = 84,601,045,583.67/405,373.28
  6. Step 6: Final answer
    x = 208,699.12

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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.