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Finding the Fourth Proportional to 72,480.40, 108,720.60 and 45,908.35

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Solution

The fourth proportional to 72,480.40, 108,720.60 and 45,908.35 is: 68,862.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,480.40 : 108,720.60 = 45,908.35 : x
  2. Step 2: Convert to fraction form
    72,480.40/108,720.60 = 45,908.35/x
  3. Step 3: Cross multiply
    72,480.40x = 108,720.60 × 45,908.35
  4. Step 4: Simplify right side
    72,480.40x = 4,991,183,357.01
  5. Step 5: Solve for x
    x = 4,991,183,357.01/72,480.40
  6. Step 6: Final answer
    x = 68,862.53

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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.