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Finding the Fourth Proportional to 339,985.80, 509,978.70 and 251,412.30

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Solution

The fourth proportional to 339,985.80, 509,978.70 and 251,412.30 is: 377,118.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,985.80 : 509,978.70 = 251,412.30 : x
  2. Step 2: Convert to fraction form
    339,985.80/509,978.70 = 251,412.30/x
  3. Step 3: Cross multiply
    339,985.80x = 509,978.70 × 251,412.30
  4. Step 4: Simplify right side
    339,985.80x = 128,214,917,918.01
  5. Step 5: Solve for x
    x = 128,214,917,918.01/339,985.80
  6. Step 6: Final answer
    x = 377,118.45

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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.