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Finding the Fourth Proportional to 328,012.55, 490,221.67 and 239,452.55

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Solution

The fourth proportional to 328,012.55, 490,221.67 and 239,452.55 is: 357,866.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,012.55 : 490,221.67 = 239,452.55 : x
  2. Step 2: Convert to fraction form
    328,012.55/490,221.67 = 239,452.55/x
  3. Step 3: Cross multiply
    328,012.55x = 490,221.67 × 239,452.55
  4. Step 4: Simplify right side
    328,012.55x = 117,384,830,941.82
  5. Step 5: Solve for x
    x = 117,384,830,941.82/328,012.55
  6. Step 6: Final answer
    x = 357,866.88

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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.