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Finding the Fourth Proportional to 339,907.60, 509,402.12 and 129,430.72

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Solution

The fourth proportional to 339,907.60, 509,402.12 and 129,430.72 is: 193,971.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,907.60 : 509,402.12 = 129,430.72 : x
  2. Step 2: Convert to fraction form
    339,907.60/509,402.12 = 129,430.72/x
  3. Step 3: Cross multiply
    339,907.60x = 509,402.12 × 129,430.72
  4. Step 4: Simplify right side
    339,907.60x = 65,932,283,161.13
  5. Step 5: Solve for x
    x = 65,932,283,161.13/339,907.60
  6. Step 6: Final answer
    x = 193,971.19

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1.5x scale

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.