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Finding the Fourth Proportional to 339,709.76, 509,563.92 and 90,391.76

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Solution

The fourth proportional to 339,709.76, 509,563.92 and 90,391.76 is: 135,587.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,709.76 : 509,563.92 = 90,391.76 : x
  2. Step 2: Convert to fraction form
    339,709.76/509,563.92 = 90,391.76/x
  3. Step 3: Cross multiply
    339,709.76x = 509,563.92 × 90,391.76
  4. Step 4: Simplify right side
    339,709.76x = 46,060,379,561.30
  5. Step 5: Solve for x
    x = 46,060,379,561.30/339,709.76
  6. Step 6: Final answer
    x = 135,587.45

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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.