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Finding the Fourth Proportional to 72,611.18, 100,203.11 and 40,351.06

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Solution

The fourth proportional to 72,611.18, 100,203.11 and 40,351.06 is: 55,684.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,611.18 : 100,203.11 = 40,351.06 : x
  2. Step 2: Convert to fraction form
    72,611.18/100,203.11 = 40,351.06/x
  3. Step 3: Cross multiply
    72,611.18x = 100,203.11 × 40,351.06
  4. Step 4: Simplify right side
    72,611.18x = 4,043,301,001.03
  5. Step 5: Solve for x
    x = 4,043,301,001.03/72,611.18
  6. Step 6: Final answer
    x = 55,684.28

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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.