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Finding the Fourth Proportional to 328,100.80, 492,151.20 and 78,782.80

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Solution

The fourth proportional to 328,100.80, 492,151.20 and 78,782.80 is: 118,174.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,100.80 : 492,151.20 = 78,782.80 : x
  2. Step 2: Convert to fraction form
    328,100.80/492,151.20 = 78,782.80/x
  3. Step 3: Cross multiply
    328,100.80x = 492,151.20 × 78,782.80
  4. Step 4: Simplify right side
    328,100.80x = 38,773,049,559.36
  5. Step 5: Solve for x
    x = 38,773,049,559.36/328,100.80
  6. Step 6: Final answer
    x = 118,174.20

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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.