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Finding the Fourth Proportional to 72,721, 100,383.56 and 45,858.16

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Solution

The fourth proportional to 72,721, 100,383.56 and 45,858.16 is: 63,302.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,721 : 100,383.56 = 45,858.16 : x
  2. Step 2: Convert to fraction form
    72,721/100,383.56 = 45,858.16/x
  3. Step 3: Cross multiply
    72,721x = 100,383.56 × 45,858.16
  4. Step 4: Simplify right side
    72,721x = 4,603,405,355.85
  5. Step 5: Solve for x
    x = 4,603,405,355.85/72,721
  6. Step 6: Final answer
    x = 63,302.28

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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.