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Finding the Fourth Proportional to 339,978.30, 509,967.45 and 140,232.30

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Solution

The fourth proportional to 339,978.30, 509,967.45 and 140,232.30 is: 210,348.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,978.30 : 509,967.45 = 140,232.30 : x
  2. Step 2: Convert to fraction form
    339,978.30/509,967.45 = 140,232.30/x
  3. Step 3: Cross multiply
    339,978.30x = 509,967.45 × 140,232.30
  4. Step 4: Simplify right side
    339,978.30x = 71,513,908,438.64
  5. Step 5: Solve for x
    x = 71,513,908,438.64/339,978.30
  6. Step 6: Final answer
    x = 210,348.45

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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.