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Finding the Fourth Proportional to 405,812.38, 608,712.39 and 139,575.20

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Solution

The fourth proportional to 405,812.38, 608,712.39 and 139,575.20 is: 209,360.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,812.38 : 608,712.39 = 139,575.20 : x
  2. Step 2: Convert to fraction form
    405,812.38/608,712.39 = 139,575.20/x
  3. Step 3: Cross multiply
    405,812.38x = 608,712.39 × 139,575.20
  4. Step 4: Simplify right side
    405,812.38x = 84,961,154,349.73
  5. Step 5: Solve for x
    x = 84,961,154,349.73/405,812.38
  6. Step 6: Final answer
    x = 209,360.68

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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.