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Finding the Fourth Proportional to 405,019.80, 607,529.70 and 279,048.60

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Solution

The fourth proportional to 405,019.80, 607,529.70 and 279,048.60 is: 418,572.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,019.80 : 607,529.70 = 279,048.60 : x
  2. Step 2: Convert to fraction form
    405,019.80/607,529.70 = 279,048.60/x
  3. Step 3: Cross multiply
    405,019.80x = 607,529.70 × 279,048.60
  4. Step 4: Simplify right side
    405,019.80x = 169,530,312,243.42
  5. Step 5: Solve for x
    x = 169,530,312,243.42/405,019.80
  6. Step 6: Final answer
    x = 418,572.90

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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.