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Finding the Fourth Proportional to 330,685.72, 493,782.66 and 321,717.66

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Solution

The fourth proportional to 330,685.72, 493,782.66 and 321,717.66 is: 480,391.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    330,685.72 : 493,782.66 = 321,717.66 : x
  2. Step 2: Convert to fraction form
    330,685.72/493,782.66 = 321,717.66/x
  3. Step 3: Cross multiply
    330,685.72x = 493,782.66 × 321,717.66
  4. Step 4: Simplify right side
    330,685.72x = 158,858,601,923.78
  5. Step 5: Solve for x
    x = 158,858,601,923.78/330,685.72
  6. Step 6: Final answer
    x = 480,391.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.