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Finding the Fourth Proportional to 279,948.80, 419,923.20 and 139,980.80

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Solution

The fourth proportional to 279,948.80, 419,923.20 and 139,980.80 is: 209,971.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,948.80 : 419,923.20 = 139,980.80 : x
  2. Step 2: Convert to fraction form
    279,948.80/419,923.20 = 139,980.80/x
  3. Step 3: Cross multiply
    279,948.80x = 419,923.20 × 139,980.80
  4. Step 4: Simplify right side
    279,948.80x = 58,781,185,474.56
  5. Step 5: Solve for x
    x = 58,781,185,474.56/279,948.80
  6. Step 6: Final answer
    x = 209,971.20

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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.