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Finding the Fourth Proportional to 405,807.56, 608,705.18 and 139,570.37

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Solution

The fourth proportional to 405,807.56, 608,705.18 and 139,570.37 is: 209,353.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,807.56 : 608,705.18 = 139,570.37 : x
  2. Step 2: Convert to fraction form
    405,807.56/608,705.18 = 139,570.37/x
  3. Step 3: Cross multiply
    405,807.56x = 608,705.18 × 139,570.37
  4. Step 4: Simplify right side
    405,807.56x = 84,957,208,017.43
  5. Step 5: Solve for x
    x = 84,957,208,017.43/405,807.56
  6. Step 6: Final answer
    x = 209,353.44

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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.