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Finding the Fourth Proportional to 40,808.40, 61,212.60 and 21,080.40

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Solution

The fourth proportional to 40,808.40, 61,212.60 and 21,080.40 is: 31,620.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,808.40 : 61,212.60 = 21,080.40 : x
  2. Step 2: Convert to fraction form
    40,808.40/61,212.60 = 21,080.40/x
  3. Step 3: Cross multiply
    40,808.40x = 61,212.60 × 21,080.40
  4. Step 4: Simplify right side
    40,808.40x = 1,290,386,093.04
  5. Step 5: Solve for x
    x = 1,290,386,093.04/40,808.40
  6. Step 6: Final answer
    x = 31,620.60

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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.