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Finding the Fourth Proportional to 305,669.34, 458,356.54 and 128,128.68

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Solution

The fourth proportional to 305,669.34, 458,356.54 and 128,128.68 is: 192,131.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,669.34 : 458,356.54 = 128,128.68 : x
  2. Step 2: Convert to fraction form
    305,669.34/458,356.54 = 128,128.68/x
  3. Step 3: Cross multiply
    305,669.34x = 458,356.54 × 128,128.68
  4. Step 4: Simplify right side
    305,669.34x = 58,728,618,439.57
  5. Step 5: Solve for x
    x = 58,728,618,439.57/305,669.34
  6. Step 6: Final answer
    x = 192,131.20

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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.