Home / 40,840.12-61,128.90-21,091.72

Finding the Fourth Proportional to 40,840.12, 61,128.90 and 21,091.72

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Solution

The fourth proportional to 40,840.12, 61,128.90 and 21,091.72 is: 31,569.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,840.12 : 61,128.90 = 21,091.72 : x
  2. Step 2: Convert to fraction form
    40,840.12/61,128.90 = 21,091.72/x
  3. Step 3: Cross multiply
    40,840.12x = 61,128.90 × 21,091.72
  4. Step 4: Simplify right side
    40,840.12x = 1,289,313,642.71
  5. Step 5: Solve for x
    x = 1,289,313,642.71/40,840.12
  6. Step 6: Final answer
    x = 31,569.78

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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.