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Finding the Fourth Proportional to 145,361.22, 218,369.88 and 86,235.81

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Solution

The fourth proportional to 145,361.22, 218,369.88 and 86,235.81 is: 129,548.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,361.22 : 218,369.88 = 86,235.81 : x
  2. Step 2: Convert to fraction form
    145,361.22/218,369.88 = 86,235.81/x
  3. Step 3: Cross multiply
    145,361.22x = 218,369.88 × 86,235.81
  4. Step 4: Simplify right side
    145,361.22x = 18,831,303,481.40
  5. Step 5: Solve for x
    x = 18,831,303,481.40/145,361.22
  6. Step 6: Final answer
    x = 129,548.33

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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.