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Finding the Fourth Proportional to 61,939.85, 85,512.46 and 40,780.63

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Solution

The fourth proportional to 61,939.85, 85,512.46 and 40,780.63 is: 56,300.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,939.85 : 85,512.46 = 40,780.63 : x
  2. Step 2: Convert to fraction form
    61,939.85/85,512.46 = 40,780.63/x
  3. Step 3: Cross multiply
    61,939.85x = 85,512.46 × 40,780.63
  4. Step 4: Simplify right side
    61,939.85x = 3,487,251,991.65
  5. Step 5: Solve for x
    x = 3,487,251,991.65/61,939.85
  6. Step 6: Final answer
    x = 56,300.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.