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Finding the Fourth Proportional to 72,430.20, 108,645.30 and 19,839.60

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Solution

The fourth proportional to 72,430.20, 108,645.30 and 19,839.60 is: 29,759.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,430.20 : 108,645.30 = 19,839.60 : x
  2. Step 2: Convert to fraction form
    72,430.20/108,645.30 = 19,839.60/x
  3. Step 3: Cross multiply
    72,430.20x = 108,645.30 × 19,839.60
  4. Step 4: Simplify right side
    72,430.20x = 2,155,479,293.88
  5. Step 5: Solve for x
    x = 2,155,479,293.88/72,430.20
  6. Step 6: Final answer
    x = 29,759.40

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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.