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Finding the Fourth Proportional to 72,138.44, 99,551.54 and 40,308.68

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Solution

The fourth proportional to 72,138.44, 99,551.54 and 40,308.68 is: 55,626.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,138.44 : 99,551.54 = 40,308.68 : x
  2. Step 2: Convert to fraction form
    72,138.44/99,551.54 = 40,308.68/x
  3. Step 3: Cross multiply
    72,138.44x = 99,551.54 × 40,308.68
  4. Step 4: Simplify right side
    72,138.44x = 4,012,791,169.37
  5. Step 5: Solve for x
    x = 4,012,791,169.37/72,138.44
  6. Step 6: Final answer
    x = 55,626.25

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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.