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Finding the Fourth Proportional to 72,485.80, 108,642.30 and 30,365.80

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Solution

The fourth proportional to 72,485.80, 108,642.30 and 30,365.80 is: 45,512.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,485.80 : 108,642.30 = 30,365.80 : x
  2. Step 2: Convert to fraction form
    72,485.80/108,642.30 = 30,365.80/x
  3. Step 3: Cross multiply
    72,485.80x = 108,642.30 × 30,365.80
  4. Step 4: Simplify right side
    72,485.80x = 3,299,010,353.34
  5. Step 5: Solve for x
    x = 3,299,010,353.34/72,485.80
  6. Step 6: Final answer
    x = 45,512.51

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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.