Home / 31,004.12-42,792.48-20,394.80

Finding the Fourth Proportional to 31,004.12, 42,792.48 and 20,394.80

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Solution

The fourth proportional to 31,004.12, 42,792.48 and 20,394.80 is: 28,149.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,004.12 : 42,792.48 = 20,394.80 : x
  2. Step 2: Convert to fraction form
    31,004.12/42,792.48 = 20,394.80/x
  3. Step 3: Cross multiply
    31,004.12x = 42,792.48 × 20,394.80
  4. Step 4: Simplify right side
    31,004.12x = 872,744,071.10
  5. Step 5: Solve for x
    x = 872,744,071.10/31,004.12
  6. Step 6: Final answer
    x = 28,149.29

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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.