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Finding the Fourth Proportional to 61,279.20, 91,821.60 and 40,478.40

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Solution

The fourth proportional to 61,279.20, 91,821.60 and 40,478.40 is: 60,653.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,279.20 : 91,821.60 = 40,478.40 : x
  2. Step 2: Convert to fraction form
    61,279.20/91,821.60 = 40,478.40/x
  3. Step 3: Cross multiply
    61,279.20x = 91,821.60 × 40,478.40
  4. Step 4: Simplify right side
    61,279.20x = 3,716,791,453.44
  5. Step 5: Solve for x
    x = 3,716,791,453.44/61,279.20
  6. Step 6: Final answer
    x = 60,653.39

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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.