Home / 71,828.10-99,122.67-39,999.78

Finding the Fourth Proportional to 71,828.10, 99,122.67 and 39,999.78

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Solution

The fourth proportional to 71,828.10, 99,122.67 and 39,999.78 is: 55,199.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,828.10 : 99,122.67 = 39,999.78 : x
  2. Step 2: Convert to fraction form
    71,828.10/99,122.67 = 39,999.78/x
  3. Step 3: Cross multiply
    71,828.10x = 99,122.67 × 39,999.78
  4. Step 4: Simplify right side
    71,828.10x = 3,964,884,993.01
  5. Step 5: Solve for x
    x = 3,964,884,993.01/71,828.10
  6. Step 6: Final answer
    x = 55,199.64

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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.