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Finding the Fourth Proportional to 479,782.56, 661,222.80 and 318,352.80

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Solution

The fourth proportional to 479,782.56, 661,222.80 and 318,352.80 is: 438,744.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,782.56 : 661,222.80 = 318,352.80 : x
  2. Step 2: Convert to fraction form
    479,782.56/661,222.80 = 318,352.80/x
  3. Step 3: Cross multiply
    479,782.56x = 661,222.80 × 318,352.80
  4. Step 4: Simplify right side
    479,782.56x = 210,502,129,803.84
  5. Step 5: Solve for x
    x = 210,502,129,803.84/479,782.56
  6. Step 6: Final answer
    x = 438,744.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.