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Finding the Fourth Proportional to 405,808.60, 608,712.90 and 395,440.60

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Solution

The fourth proportional to 405,808.60, 608,712.90 and 395,440.60 is: 593,160.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,808.60 : 608,712.90 = 395,440.60 : x
  2. Step 2: Convert to fraction form
    405,808.60/608,712.90 = 395,440.60/x
  3. Step 3: Cross multiply
    405,808.60x = 608,712.90 × 395,440.60
  4. Step 4: Simplify right side
    405,808.60x = 240,709,794,403.74
  5. Step 5: Solve for x
    x = 240,709,794,403.74/405,808.60
  6. Step 6: Final answer
    x = 593,160.90

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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.