Home / 31,412.52-43,360.68-20,805.60

Finding the Fourth Proportional to 31,412.52, 43,360.68 and 20,805.60

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Solution

The fourth proportional to 31,412.52, 43,360.68 and 20,805.60 is: 28,719.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,412.52 : 43,360.68 = 20,805.60 : x
  2. Step 2: Convert to fraction form
    31,412.52/43,360.68 = 20,805.60/x
  3. Step 3: Cross multiply
    31,412.52x = 43,360.68 × 20,805.60
  4. Step 4: Simplify right side
    31,412.52x = 902,144,963.81
  5. Step 5: Solve for x
    x = 902,144,963.81/31,412.52
  6. Step 6: Final answer
    x = 28,719.28

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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.