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Finding the Fourth Proportional to 72,428.40, 108,642.60 and 57,556.80

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Solution

The fourth proportional to 72,428.40, 108,642.60 and 57,556.80 is: 86,335.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,428.40 : 108,642.60 = 57,556.80 : x
  2. Step 2: Convert to fraction form
    72,428.40/108,642.60 = 57,556.80/x
  3. Step 3: Cross multiply
    72,428.40x = 108,642.60 × 57,556.80
  4. Step 4: Simplify right side
    72,428.40x = 6,253,120,399.68
  5. Step 5: Solve for x
    x = 6,253,120,399.68/72,428.40
  6. Step 6: Final answer
    x = 86,335.20

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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.