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Finding the Fourth Proportional to 60,714.80, 91,072.20 and 39,719.60

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Solution

The fourth proportional to 60,714.80, 91,072.20 and 39,719.60 is: 59,579.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,714.80 : 91,072.20 = 39,719.60 : x
  2. Step 2: Convert to fraction form
    60,714.80/91,072.20 = 39,719.60/x
  3. Step 3: Cross multiply
    60,714.80x = 91,072.20 × 39,719.60
  4. Step 4: Simplify right side
    60,714.80x = 3,617,351,355.12
  5. Step 5: Solve for x
    x = 3,617,351,355.12/60,714.80
  6. Step 6: Final answer
    x = 59,579.40

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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.