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Finding the Fourth Proportional to 405,728.76, 608,607 and 139,486.98

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Solution

The fourth proportional to 405,728.76, 608,607 and 139,486.98 is: 209,235.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,728.76 : 608,607 = 139,486.98 : x
  2. Step 2: Convert to fraction form
    405,728.76/608,607 = 139,486.98/x
  3. Step 3: Cross multiply
    405,728.76x = 608,607 × 139,486.98
  4. Step 4: Simplify right side
    405,728.76x = 84,892,752,436.86
  5. Step 5: Solve for x
    x = 84,892,752,436.86/405,728.76
  6. Step 6: Final answer
    x = 209,235.23

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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.