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Finding the Fourth Proportional to 305,661.79, 458,345.21 and 128,121.13

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Solution

The fourth proportional to 305,661.79, 458,345.21 and 128,121.13 is: 192,119.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,661.79 : 458,345.21 = 128,121.13 : x
  2. Step 2: Convert to fraction form
    305,661.79/458,345.21 = 128,121.13/x
  3. Step 3: Cross multiply
    305,661.79x = 458,345.21 × 128,121.13
  4. Step 4: Simplify right side
    305,661.79x = 58,723,704,448.82
  5. Step 5: Solve for x
    x = 58,723,704,448.82/305,661.79
  6. Step 6: Final answer
    x = 192,119.88

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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.