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Finding the Fourth Proportional to 305,924.80, 458,887.20 and 139,712.80

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Solution

The fourth proportional to 305,924.80, 458,887.20 and 139,712.80 is: 209,569.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,924.80 : 458,887.20 = 139,712.80 : x
  2. Step 2: Convert to fraction form
    305,924.80/458,887.20 = 139,712.80/x
  3. Step 3: Cross multiply
    305,924.80x = 458,887.20 × 139,712.80
  4. Step 4: Simplify right side
    305,924.80x = 64,112,415,596.16
  5. Step 5: Solve for x
    x = 64,112,415,596.16/305,924.80
  6. Step 6: Final answer
    x = 209,569.20

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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.